Clinical trial NCT05148793: N95 Reuse During COVID-19
Official title: A Clinical Examination of N95 Reuse and Extended Use
Study type: OBSERVATIONAL
Overall status: COMPLETED
Conditions: Emergency Medicine
Frontline Providers
Healthcare Worker
Keywords: N95 mask
Personal Protective Equipment
Extended use
reuse
Lead sponsor: University of California, San Francisco
Sponsor class: OTHER
Collaborators: name: University of California, San Diego
name: Johns Hopkins University
name: University of Wisconsin, Madison
name: Emory University
name: University of Rochester
name: Centers for Disease Control and Prevention
First posted: 2021-12-08
Enrollment: 412
Sex: ALL
Minimum age (years): 18
Standard ages: ADULT
OLDER_ADULT
Accepts healthy volunteers: yes
Observational model: COHORT
Time perspective: PROSPECTIVE
Sampling method: PROBABILITY_SAMPLE
Study population: Healthcare provider, specifically frontline workers that involves direct patient contact.

Brief summary: During critical personal protective equipment (PPE) shortages, such as those associated with the COVID-19 pandemic, Centers for Disease Control (CDC) recommends N95 extended use (wearing the same N95 for multiple patient encounters) and limited reuse (storing an N95 between shifts for use over multiple shifts with or without decontamination) as contingency and crisis capacity strategies, respectively. Many healthcare workers (HCWs) are employing these strategies out of necessity. The sustained performance of these respirators depends on the respirator maintaining its filtration efficiency and its ability to provide an adequate seal (fit) to the user's face. Fit testing is performed when a respirator is issued to the user and on an annual basis thereafter. A user-seal check is then performed whenever a respirator is donned. Previous studies have found repeated donnings/doffings to significantly decrease the respirator's fit. A recent pilot cross-sectional clinical study conducted by the University of California, San Francisco found fit failures of respirators after being worn for 2 shifts. However, more definitive data regarding respirator performance during reuse and extended use are lacking. The investigators plan to address these critical gaps in knowledge by conducting a prospective cohort study to determine the incidence of N95 fit failure when subjected to extended use/reuse in a clinical setting. The investigators plan to enroll 396 ED providers (including physicians, nurses, and staff) when obtaining a new NIOSH approved N95s and performing serial fit tests at the end of each 8-12 hour shift for up to 5 clinical shifts or until N95 failure, whichever is earlier. By carefully measuring fit test failure in a clinical setting, the investigators will be able to provide guidance regarding the safety of N95 extended use and reuse necessitated by the need for PPE conservation. Specifically, the investigators will address the following research questions: 1) how long N95s maintain their fit during extended use, 2) how many times N95s can be donned/doffed and maintain their fit, 3) the ability of a user seal check to indicate fit in the field, 4) what adverse health effects, reports of discomfort, or symptoms are experienced by users during extended use and reuse, 5) what effect does extended use and reuse have on N95 filtration performance, 6) the level of contamination of N95s when subjected to extended use and reuse, 7) the effect of modifications to N95 (covering an N95 with a face shield or surgical N95s, facial coverings) on fit failure.

Detailed description: Frontline healthcare workers are at high risk of SARS (severe acute respiratory syndrome) CoV-2 (COVID-19) infection. Personal protective equipment (PPE), such as an N95 respirator (N95), is essential for prevention of COVID-19 among HCWs. N95s can prevent aerosolized transmission of viral particles and reduce COVID-19 among HCWs, helping to reduce infection rates and preserve the workforce. Under normal circumstances, the CDC recommends that HCWs dispose of N95s after a single patient encounter. However, during critical PPE shortages such as those during the current COVID-19 pandemic, the CDC recommends N95 extended use (wearing the same N95 for multiple patient encounters) and re-use (storing an N95 between shifts for use over multiple shifts). N95 shortages have been widely reported during the COVID-19 pandemic and have forced HCWs to practice extended use and reuse of N95s. Despite the CDC's guidelines, there are limited data regarding the efficacy of N95s under conditions of extended use and reuse and existing studies have been conducted in laboratory settings rather than in the actual health care environment. (Bergman 2012; Vuma et al 2019). This has left health care workers, including emergency department (ED) providers on the front lines of the COVID-19 pandemic, without clear guidance regarding N95 conservation. Many have implemented various reuse and extended use policies out of necessity but with no empirical evidence of their safety and effectiveness.

The study team conducted a pilot cross-sectional study of 68 ED providers who wore either a 3M 1860 dome style N95 or a duckbill N951. 70.6% of duckbill N95 failed a standardized fit test with 3M bitter solution and a hood. Of the dome style , 27.5% failed a fit test. N95 failure was associated with increasing numbers of shifts used: There were 0/11 failures after 1 shift, 1/12 failures after 2 shifts, 3/13 failures after 3 shifts, and 10/15 failures after 4 or more shifts. Also, more donnings and doffings were associated with fit failure, with a median of 8 donning and doffings in the fit pass group and 15 donning and doffings in the fit failure group. This preliminary study had a number of limitations, including a small sample size, convenience sampling, and cross-sectional design, and so was unable to definitively identify the number of shifts or donnings/doffings for which N95s can be safely reused.

The investigators propose to conduct a prospective cohort study of 396 participants across 6 ED sites to estimate the cumulative incidence of N95s when subjected to extended use and reuse in a clinical (emergency department) setting with fit test failure and contamination as the main endpoints. The investigators also seek to compare the fit test failure between varying types of HCWs wearing a number of N95 types. Additionally, the investigators will collect the N95s used in this study for additional analyses of at an outside laboratory measuring COVID-19 contamination levels and filtration efficiency.

Eligibility criteria: Inclusion criteria

* Adult (18 years old or greater)
* ED providers (MDs, nurses, Advanced Practice Providers (APPs)) who are practicing extended use and re-use for the majority (more than half) of their shifts Participants are eligible when obtaining a new N95 and are scheduled to work a minimum of 5 shifts within a 60-day period. As hours of enrollment and data collection depend on research associate availability, participants working certain shifts may not be eligible.

Exclusion criteria:

* Participant does not intend to use N95 for majority of shift
* Schedule prohibits re-use and or data collection
* Repeated failed baseline fit test
* Refused or unable to consent
* Pregnant
* Facial hair (e.g., beards or sideburns) or jewelry which interferes with the face seal region of an N95

Primary outcomes:
measure: Number of participants with qualitative fit test failure (N95 A, end of shift 1)
timeFrame: At the end of shift A1, up to 12 hours
measure: Number of participants with qualitative fit test failure (N95 A, end of shift 2)
timeFrame: At the end of shift A2, up to 12 hours per shift, 24 hours maximum
measure: Number of participants with qualitative fit test failure (N95 A, end of shift 3)
timeFrame: At the end of shift A3, up to 12 hours per shift, 36 hours maximum
measure: Number of participants with qualitative fit test failure (N95 A, end of shift 4)
timeFrame: At the end of shift A4, up to 12 hours per shift, 48 hours maximum
measure: Number of participants with qualitative fit test failure (N95 A, end of shift 5)
timeFrame: At the end of shift A5, up to 12 hours per shift, 60 hours maximum
measure: Number of participants with qualitative fit test failure (N95 B, end of shift 1)
timeFrame: At the end of shift B1, up to 12 hours maximum
measure: Number of participants with qualitative fit test failure (N95 B, end of shift 2)
timeFrame: At the end of shift B2, up to 12 hours per shift, 24 hours maximum
measure: Number of participants with qualitative fit test failure (N95 B, end of shift 3)
timeFrame: At the end of shift B3, up to 12 hours per shift, 36 hours maximum
measure: Number of participants with qualitative fit test failure (N95 B, end of shift 4)
timeFrame: At the end of shift B4, up to 12 hours per shift, 48 hours maximum
measure: Number of participants with qualitative fit test failure (N95 B, end of shift 5)
timeFrame: At the end of shift B5, up to 12 hours per shift, 60 hours maximum
Secondary outcomes:
measure: Number of participants with User Seal Check failure (N95 A, end of shift 1)
timeFrame: At the end of shift A1, up to 12 hours maximum
measure: Number of participants with User Seal Check failure (N95 A, end of shift 2)
timeFrame: At the end of shift A2, up to 12 hours per shift, 24 hours maximum
measure: Number of participants with User Seal Check failure (N95 A, end of shift 3)
timeFrame: At the end of shift A3, up to 12 hours per shift, 36 hours maximum
measure: Number of participants with User Seal Check failure (N95 A, end of shift 4)
timeFrame: At the end of shift A4, up to 12 hours per shift, 48 hours maximum
measure: Number of participants with User Seal Check failure (N95 A, end of shift 5)
timeFrame: At the end of shift A5, up to 12 hours per shift, 60 hours maximum
measure: Number of participants with User Seal Check failure (N95 B, end of shift 1)
timeFrame: At the end of shift B1, up to 12 hours maximum
measure: Number of participants with User Seal Check failure (N95 B, end of shift 2)
timeFrame: At the end of shift B2, up to 12 hours per shift, 24 hours maximum
measure: Number of participants with User Seal Check failure (N95 B, end of shift 3)
timeFrame: At the end of shift B3, up to 12 hours per shift, 36 hours maximum
measure: Number of participants with User Seal Check failure (N95 B, end of shift 4)
timeFrame: At the end of shift B4, up to 12 hours per shift, 48 hours maximum
measure: Number of participants with User Seal Check failure (N95 B, end of shift 5)
timeFrame: At the end of shift B5, up to 12 hours per shift, 60 hours maximum
Other outcomes:
measure: Number of participants with qualitative fit test failure of Mask A (at Baseline)
timeFrame: Prior to study inclusion
measure: N95 B Outcome
timeFrame: Within 6 months of enrollment
measure: N95 A Outcome
timeFrame: Within 6 months of enrollment
measure: N95 contamination as measured by Real-time Quantitative Polymerase Chain Reaction (RTqPCR) for COVID-19 (to be assessed by collecting masks and sending out to lab)
timeFrame: At the end of all study shifts, up to 10 visits (60 hours maximum).
measure: N95 filtration as measured using TSI 8130, measuring flow rate (ml/min), particle penetration (%), and pressure drop (mmH2O).
timeFrame: At the end of all study shifts, up to 10 visits (60 hours maximum).
measure: Participant reported symptoms (comfort)
timeFrame: At the end of each shift, up to 12 hours
measure: Number of N95 donnings and doffings for Mask A during shift 1 (N95 A, end of shift 1)
timeFrame: At the end of shift A1, up to 12 hours maximum
measure: Number of N95 donnings and doffings for Mask A during shift 2 (N95 A, end of shift 2)
timeFrame: At the end of shift A2, up to 12 hours per shift, 24 hours maximum
measure: Number of N95 donnings and doffings for Mask A during shift 3 (N95 A, end of shift 3)
timeFrame: At the end of shift A3, up to 12 hours per shift, 36 hours maximum
measure: Number of N95 donnings and doffings for Mask A during shift 4 (N95 A, end of shift 4)
timeFrame: At the end of shift A4, up to 12 hours per shift, 48 hours maximum
measure: Number of N95 donnings and doffings for Mask A during shift 5 (N95 A, end of shift 5)
timeFrame: At the end of shift A5, up to 12 hours per shift, 60 hours maximum
measure: Number of N95 donnings and doffings for Mask B during shift 1 (N95 B, end of shift 1)
timeFrame: At the end of shift B1, up to 12 hours
measure: Number of N95 donnings and doffings for Mask B during shift 2 (N95 B, end of shift 2)
timeFrame: At the end of shift B2, up to 12 hours
measure: Number of N95 donnings and doffings for Mask B during shift 3 (N95 B, end of shift 3)
timeFrame: At the end of shift B3, up to 12 hours
measure: Number of N95 donnings and doffings for Mask B during shift 4 (N95 B, end of shift 4)
timeFrame: At the end of shift B4, up to 12 hours
measure: Number of N95 donnings and doffings for Mask B during shift 5 (N95 B, end of shift 5)
timeFrame: At the end of shift B5, up to 12 hours
measure: Number of total N95 donnings and doffings for Mask A during shifts 1-5
timeFrame: Cumulative donning/doffing for up to 5 shifts, up to 12 hours each shift.
measure: Number of total N95 donnings and doffings for Mask B during shifts 1-5
timeFrame: Cumulative donning/doffing for up to 5 shifts, up to 12 hours each shift.
measure: Shift Length (N95 A, end of shift 1)
timeFrame: At the end of shift A1, up to 12 hours per shift.
measure: Shift Length (N95 A, end of shift 2)
timeFrame: At the end of shift A2, up to 12 hours per shift.
measure: Shift Length (N95 A, end of shift 3)
timeFrame: At the end of shift A3, up to 12 hours per shift.
measure: Shift Length (N95 A, end of shift 4)
timeFrame: At the end of shift A4, up to 12 hours per shift.
measure: Shift Length (N95 A, end of shift 5)
timeFrame: At the end of shift A5, up to 12 hours per shift.
measure: Shift Length (N95 B, end of shift 1)
timeFrame: At the end of shift B1, up to 12 hours per shift.
measure: Shift Length (N95 B, end of shift 2)
timeFrame: At the end of shift B2, up to 12 hours per shift.
measure: Shift Length (N95 B, end of shift 3)
timeFrame: At the end of shift B3, up to 12 hours per shift.
measure: Shift Length (N95 B, end of shift 4)
timeFrame: At the end of shift B4, up to 12 hours per shift.
measure: Shift Length (N95 B, end of shift 5)
timeFrame: At the end of shift B5, up to 12 hours per shift.
measure: Cumulative Shift Length (N95 A)
timeFrame: Up to 5 shifts, up to 12 hours per shift.
measure: Cumulative Shift Length (N95 B)
timeFrame: Up to 5 shifts, up to 12 hours per shift.
measure: Estimated Hours Worn (N95 A, end of shift 1)
timeFrame: At the end of shift A1, up to 12 hours per shift.
measure: Estimated Hours Worn (N95 A, end of shift 2)
timeFrame: At the end of shift A2, up to 12 hours per shift.
measure: Estimated Hours Worn (N95 A, end of shift 3)
timeFrame: At the end of shift A3, up to 12 hours per shift.
measure: Estimated Hours Worn (N95 A, end of shift 4)
timeFrame: At the end of shift A4, up to 12 hours per shift.
measure: Estimated Hours Worn (N95 A, end of shift 5)
timeFrame: At the end of shift A5, up to 12 hours per shift.
measure: Estimated Hours Worn (N95 B, end of shift 1)
timeFrame: At the end of shift B1, up to 12 hours per shift.
measure: Estimated Hours Worn (N95 B, end of shift 2)
timeFrame: At the end of shift B2, up to 12 hours per shift.
measure: Estimated Hours Worn (N95 B, end of shift 3)
timeFrame: At the end of shift B3, up to 12 hours per shift.
measure: Estimated Hours Worn (N95 B, end of shift 4)
timeFrame: At the end of shift B4, up to 12 hours per shift.
measure: Estimated Hours Worn (N95 B, end of shift 5)
timeFrame: At the end of shift B5, up to 12 hours per shift.
measure: Cumulative Estimated Hours Worn (N95 A)
timeFrame: Total estimated hours worn for up to 5 shifts, up to 12 hours per shift.
measure: Cumulative Estimated Hours Worn (N95 B)
timeFrame: Total estimated hours worn for up to 5 shifts, up to 12 hours per shift.
measure: Tightness of Straps, A1
timeFrame: At the end of shift A1, up to 12 hours
measure: Tightness of Straps, A2
timeFrame: At the end of shift A2, up to 12 hours
measure: Tightness of Straps, A3
timeFrame: At the end of shift A3, up to 12 hours
measure: Tightness of Straps, A4
timeFrame: At the end of shift A4, up to 12 hours
measure: Tightness of Straps, A5
timeFrame: At the end of shift A5, up to 12 hours
measure: Tightness of Straps, B1
timeFrame: At the end of shift B1, up to 12 hours
measure: Tightness of Straps, B2
timeFrame: At the end of shift B2, up to 12 hours
measure: Tightness of Straps, B3
timeFrame: At the end of shift B3, up to 12 hours
measure: Tightness of Straps, B4
timeFrame: At the end of shift B4, up to 12 hours
measure: Tightness of Straps, B5
timeFrame: At the end of shift B5, up to 12 hours
measure: Facial Irritation, A1
timeFrame: At the end of shift A1, up to 12 hours
measure: Facial Irritation, A2
timeFrame: At the end of shift A2, up to 12 hours
measure: Facial Irritation, A3
timeFrame: At the end of shift A3, up to 12 hours
measure: Facial Irritation, A4
timeFrame: At the end of shift A4, up to 12 hours
measure: Facial Irritation, A5
timeFrame: At the end of shift A5, up to 12 hours
measure: Facial Irritation, B1
timeFrame: At the end of shift B1, up to 12 hours
measure: Facial Irritation, B2
timeFrame: At the end of shift B2, up to 12 hours
measure: Facial Irritation, B3
timeFrame: At the end of shift B3, up to 12 hours
measure: Facial Irritation, B4
timeFrame: At the end of shift B4, up to 12 hours
measure: Facial Irritation, B5
timeFrame: At the end of shift B5, up to 12 hours
measure: Facial Itching, A1
timeFrame: At the end of shift A1, up to 12 hours
measure: Facial Itching, A2
timeFrame: At the end of shift A2, up to 12 hours
measure: Facial Itching, A3
timeFrame: At the end of shift A3, up to 12 hours
measure: Facial Itching, A4
timeFrame: At the end of shift A4, up to 12 hours
measure: Facial Itching, A5
timeFrame: At the end of shift A5, up to 12 hours
measure: Facial Itching, B1
timeFrame: At the end of shift B1, up to 12 hours
measure: Facial Itching, B2
timeFrame: At the end of shift B2, up to 12 hours
measure: Facial Itching, B3
timeFrame: At the end of shift B3, up to 12 hours
measure: Facial Itching, B4
timeFrame: At the end of shift B4, up to 12 hours
measure: Facial Itching, B5
timeFrame: At the end of shift B5, up to 12 hours
measure: Facial Pinching, A1
timeFrame: At the end of shift A1, up to 12 hours
measure: Facial Pinching, A2
timeFrame: At the end of shift A2, up to 12 hours
measure: Facial Pinching, A3
timeFrame: At the end of shift A3, up to 12 hours
measure: Facial Pinching, A4
timeFrame: At the end of shift A4, up to 12 hours
measure: Facial Pinching, A5
timeFrame: At the end of shift A5, up to 12 hours
measure: Facial Pinching, B1
timeFrame: At the end of shift B1, up to 12 hours
measure: Facial Pinching, B2
timeFrame: At the end of shift B2, up to 12 hours
measure: Facial Pinching, B3
timeFrame: At the end of shift B3, up to 12 hours
measure: Facial Pinching, B4
timeFrame: At the end of shift B4, up to 12 hours
measure: Facial Pinching, B5
timeFrame: At the end of shift B5, up to 12 hours
measure: Nose, nose-bridge (pinching, redness from metal band), A1
timeFrame: At the end of shift A1, up to 12 hours
measure: Nose, nose-bridge (pinching, redness from metal band), A2
timeFrame: At the end of shift A2, up to 12 hours
measure: Nose, nose-bridge (pinching, redness from metal band), A3
timeFrame: At the end of shift A3, up to 12 hours
measure: Nose, nose-bridge (pinching, redness from metal band), A4
timeFrame: At the end of shift A4, up to 12 hours
measure: Nose, nose-bridge (pinching, redness from metal band), A5
timeFrame: At the end of shift A5, up to 12 hours
measure: Nose, nose-bridge (pinching, redness from metal band), B1
timeFrame: At the end of shift B1, up to 12 hours
measure: Nose, nose-bridge (pinching, redness from metal band), B2
timeFrame: At the end of shift B2, up to 12 hours
measure: Nose, nose-bridge (pinching, redness from metal band), B3
timeFrame: At the end of shift B3, up to 12 hours
measure: Nose, nose-bridge (pinching, redness from metal band), B4
timeFrame: At the end of shift B4, up to 12 hours
measure: Nose, nose-bridge (pinching, redness from metal band), B5
timeFrame: At the end of shift B5, up to 12 hours
measure: Facial Heat/Warmth, A1
timeFrame: At the end of shift A1, up to 12 hours
measure: Facial Heat/Warmth, A2
timeFrame: At the end of shift A2, up to 12 hours
measure: Facial Heat/Warmth, A3
timeFrame: At the end of shift A3, up to 12 hours
measure: Facial Heat/Warmth, A4
timeFrame: At the end of shift A4, up to 12 hours
measure: Facial Heat/Warmth, A5
timeFrame: At the end of shift A5, up to 12 hours
measure: Facial Heat/Warmth, B1
timeFrame: At the end of shift B1, up to 12 hours
measure: Facial Heat/Warmth, B2
timeFrame: At the end of shift B2, up to 12 hours
measure: Facial Heat/Warmth, B3
timeFrame: At the end of shift B3, up to 12 hours
measure: Facial Heat/Warmth, B4
timeFrame: At the end of shift B4, up to 12 hours
measure: Facial Heat/Warmth, B5
timeFrame: At the end of shift B5, up to 12 hours
measure: Sweat/Moisture buildup, A1
timeFrame: At the end of shift A1, up to 12 hours
measure: Sweat/Moisture buildup, A2
timeFrame: At the end of shift A2, up to 12 hours
measure: Sweat/Moisture buildup, A3
timeFrame: At the end of shift A3, up to 12 hours
measure: Sweat/Moisture buildup, A4
timeFrame: At the end of shift A4, up to 12 hours
measure: Sweat/Moisture buildup, A5
timeFrame: At the end of shift A5, up to 12 hours
measure: Sweat/Moisture buildup, B1
timeFrame: At the end of shift B1, up to 12 hours
measure: Sweat/Moisture buildup, B2
timeFrame: At the end of shift B2, up to 12 hours
measure: Sweat/Moisture buildup, B3
timeFrame: At the end of shift B3, up to 12 hours
measure: Sweat/Moisture buildup, B4
timeFrame: At the end of shift B4, up to 12 hours
measure: Sweat/Moisture buildup, B5
timeFrame: At the end of shift B5, up to 12 hours
measure: Lack of Fresh Air, A1
timeFrame: At the end of shift A1, up to 12 hours
measure: Lack of Fresh Air, A2
timeFrame: At the end of shift A2, up to 12 hours
measure: Lack of Fresh Air, A3
timeFrame: At the end of shift A3, up to 12 hours
measure: Lack of Fresh Air, A4
timeFrame: At the end of shift A4, up to 12 hours
measure: Lack of Fresh Air, A5
timeFrame: At the end of shift A5, up to 12 hours
measure: Lack of Fresh Air, B1
timeFrame: At the end of shift B1, up to 12 hours
measure: Lack of Fresh Air, B2
timeFrame: At the end of shift B2, up to 12 hours
measure: Lack of Fresh Air, B3
timeFrame: At the end of shift B3, up to 12 hours
measure: Lack of Fresh Air, B4
timeFrame: At the end of shift B4, up to 12 hours
measure: Lack of Fresh Air, B5
timeFrame: At the end of shift B5, up to 12 hours
measure: Nausea, A1
timeFrame: At the end of shift A1, up to 12 hours
measure: Nausea, A2
timeFrame: At the end of shift A2, up to 12 hours
measure: Nausea, A3
timeFrame: At the end of shift A3, up to 12 hours
measure: Nausea, A4
timeFrame: At the end of shift A4, up to 12 hours
measure: Nausea, A5
timeFrame: At the end of shift A5, up to 12 hours
measure: Nausea, B1
timeFrame: At the end of shift B1, up to 12 hours
measure: Nausea, B2
timeFrame: At the end of shift B2, up to 12 hours
measure: Nausea, B3
timeFrame: At the end of shift B3, up to 12 hours
measure: Nausea, B4
timeFrame: At the end of shift B4, up to 12 hours
measure: Nausea, B5
timeFrame: At the end of shift B5, up to 12 hours
measure: Headache, A1
timeFrame: At the end of shift A1, up to 12 hours
measure: Headache, A2
timeFrame: At the end of shift A2, up to 12 hours
measure: Headache, A3
timeFrame: At the end of shift A3, up to 12 hours
measure: Headache, A4
timeFrame: At the end of shift A4, up to 12 hours
measure: Headache, A5
timeFrame: At the end of shift A5, up to 12 hours
measure: Headache, B1
timeFrame: At the end of shift B1, up to 12 hours
measure: Headache, B2
timeFrame: At the end of shift B2, up to 12 hours
measure: Headache, B3
timeFrame: At the end of shift B3, up to 12 hours
measure: Headache, B4
timeFrame: At the end of shift B4, up to 12 hours
measure: Headache, B5
timeFrame: At the end of shift B5, up to 12 hours
measure: Dizziness, A1
timeFrame: At the end of shift A1, up to 12 hours
measure: Dizziness, A2
timeFrame: At the end of shift A2, up to 12 hours
measure: Dizziness, A3
timeFrame: At the end of shift A3, up to 12 hours
measure: Dizziness, A4
timeFrame: At the end of shift A4, up to 12 hours
measure: Dizziness, A5
timeFrame: At the end of shift A5, up to 12 hours
measure: Dizziness, B1
timeFrame: At the end of shift B1, up to 12 hours
measure: Dizziness, B2
timeFrame: At the end of shift B2, up to 12 hours
measure: Dizziness, B3
timeFrame: At the end of shift B3, up to 12 hours
measure: Dizziness, B4
timeFrame: At the end of shift B4, up to 12 hours
measure: Dizziness, B5
timeFrame: At the end of shift B5, up to 12 hours
measure: Loss of energy/tiredness/fatigue, A1
timeFrame: At the end of shift A1, up to 12 hours
measure: Loss of energy/tiredness/fatigue, A2
timeFrame: At the end of shift A2, up to 12 hours
measure: Loss of energy/tiredness/fatigue, A3
timeFrame: At the end of shift A3, up to 12 hours
measure: Loss of energy/tiredness/fatigue, A4
timeFrame: At the end of shift A4, up to 12 hours
measure: Loss of energy/tiredness/fatigue, A5
timeFrame: At the end of shift A5, up to 12 hours
measure: Loss of energy/tiredness/fatigue, B1
timeFrame: At the end of shift B1, up to 12 hours
measure: Loss of energy/tiredness/fatigue, B2
timeFrame: At the end of shift B2, up to 12 hours
measure: Loss of energy/tiredness/fatigue, B3
timeFrame: At the end of shift B3, up to 12 hours
measure: Loss of energy/tiredness/fatigue, B4
timeFrame: At the end of shift B4, up to 12 hours
measure: Loss of energy/tiredness/fatigue, B5
timeFrame: At the end of shift B5, up to 12 hours
measure: Claustrophobia, A1
timeFrame: At the end of shift A1, up to 12 hours
measure: Claustrophobia, A2
timeFrame: At the end of shift A2, up to 12 hours
measure: Claustrophobia, A3
timeFrame: At the end of shift A3, up to 12 hours
measure: Claustrophobia, A4
timeFrame: At the end of shift A4, up to 12 hours
measure: Claustrophobia, A5
timeFrame: At the end of shift A5, up to 12 hours
measure: Claustrophobia, B1
timeFrame: At the end of shift B1, up to 12 hours
measure: Claustrophobia, B2
timeFrame: At the end of shift B2, up to 12 hours
measure: Claustrophobia, B3
timeFrame: At the end of shift B3, up to 12 hours
measure: Claustrophobia, B4
timeFrame: At the end of shift B4, up to 12 hours
measure: Claustrophobia, B5
timeFrame: At the end of shift B5, up to 12 hours
measure: Shortness of Breath, A1
timeFrame: At the end of shift A1, up to 12 hours
measure: Shortness of Breath, A2
timeFrame: At the end of shift A2, up to 12 hours
measure: Shortness of Breath, A3
timeFrame: At the end of shift A3, up to 12 hours
measure: Shortness of Breath, A4
timeFrame: At the end of shift A4, up to 12 hours
measure: Shortness of Breath, A5
timeFrame: At the end of shift A5, up to 12 hours
measure: Shortness of Breath, B1
timeFrame: At the end of shift B1, up to 12 hours
measure: Shortness of Breath, B2
timeFrame: At the end of shift B2, up to 12 hours
measure: Shortness of Breath, B3
timeFrame: At the end of shift B3, up to 12 hours
measure: Shortness of Breath, B4
timeFrame: At the end of shift B4, up to 12 hours
measure: Shortness of Breath, B5
timeFrame: At the end of shift B5, up to 12 hours
measure: Difficulty Breathing, A1
timeFrame: At the end of shift A1, up to 12 hours
measure: Difficulty Breathing, A2
timeFrame: At the end of shift A2, up to 12 hours
measure: Difficulty Breathing, A3
timeFrame: At the end of shift A3, up to 12 hours
measure: Difficulty Breathing, A4
timeFrame: At the end of shift A4, up to 12 hours
measure: Difficulty Breathing, A5
timeFrame: At the end of shift A5, up to 12 hours
measure: Difficulty Breathing, B1
timeFrame: At the end of shift B1, up to 12 hours
measure: Difficulty Breathing, B2
timeFrame: At the end of shift B2, up to 12 hours
measure: Difficulty Breathing, B3
timeFrame: At the end of shift B3, up to 12 hours
measure: Difficulty Breathing, B4
timeFrame: At the end of shift B4, up to 12 hours
measure: Difficulty Breathing, B5
timeFrame: At the end of shift B5, up to 12 hours
measure: Dry or Itchy Eyes, A1
timeFrame: At the end of shift A1, up to 12 hours
measure: Dry or Itchy Eyes, A2
timeFrame: At the end of shift A2, up to 12 hours
measure: Dry or Itchy Eyes, A3
timeFrame: At the end of shift A3, up to 12 hours
measure: Dry or Itchy Eyes, A4
timeFrame: At the end of shift A4, up to 12 hours
measure: Dry or Itchy Eyes, A5
timeFrame: At the end of shift A5, up to 12 hours
measure: Dry or Itchy Eyes, B1
timeFrame: At the end of shift B1, up to 12 hours
measure: Dry or Itchy Eyes, B2
timeFrame: At the end of shift B2, up to 12 hours
measure: Dry or Itchy Eyes, B3
timeFrame: At the end of shift B3, up to 12 hours
measure: Dry or Itchy Eyes, B4
timeFrame: At the end of shift B4, up to 12 hours
measure: Dry or Itchy Eyes, B5
timeFrame: At the end of shift B5, up to 12 hours
measure: Concentration, A1
timeFrame: At the end of shift A1, up to 12 hours
measure: Concentration, A2
timeFrame: At the end of shift A2, up to 12 hours
measure: Concentration, A3
timeFrame: At the end of shift A3, up to 12 hours
measure: Concentration, A4
timeFrame: At the end of shift A4, up to 12 hours
measure: Concentration, A5
timeFrame: At the end of shift A5, up to 12 hours
measure: Concentration, B1
timeFrame: At the end of shift B1, up to 12 hours
measure: Concentration, B2
timeFrame: At the end of shift B2, up to 12 hours
measure: Concentration, B3
timeFrame: At the end of shift B3, up to 12 hours
measure: Concentration, B4
timeFrame: At the end of shift B4, up to 12 hours
measure: Concentration, B5
timeFrame: At the end of shift B5, up to 12 hours
measure: Verbally Communicate, A1
timeFrame: At the end of shift A1, up to 12 hours
measure: Verbally Communicate, A2
timeFrame: At the end of shift A2, up to 12 hours
measure: Verbally Communicate, A3
timeFrame: At the end of shift A3, up to 12 hours
measure: Verbally Communicate, A4
timeFrame: At the end of shift A4, up to 12 hours
measure: Verbally Communicate, A5
timeFrame: At the end of shift A5, up to 12 hours
measure: Verbally Communicate, B1
timeFrame: At the end of shift B1, up to 12 hours
measure: Verbally Communicate, B2
timeFrame: At the end of shift B2, up to 12 hours
measure: Verbally Communicate, B3
timeFrame: At the end of shift B3, up to 12 hours
measure: Verbally Communicate, B4
timeFrame: At the end of shift B4, up to 12 hours
measure: Verbally Communicate, B5
timeFrame: At the end of shift B5, up to 12 hours
measure: Hearing, A1
timeFrame: At the end of shift A1, up to 12 hours
measure: Hearing, A2
timeFrame: At the end of shift A2, up to 12 hours
measure: Hearing, A3
timeFrame: At the end of shift A3, up to 12 hours
measure: Hearing, A4
timeFrame: At the end of shift A4, up to 12 hours
measure: Hearing, A5
timeFrame: At the end of shift A5, up to 12 hours
measure: Hearing, B1
timeFrame: At the end of shift B1, up to 12 hours
measure: Hearing, B2
timeFrame: At the end of shift B2, up to 12 hours
measure: Hearing, B3
timeFrame: At the end of shift B3, up to 12 hours
measure: Hearing, B4
timeFrame: At the end of shift B4, up to 12 hours
measure: Hearing, B5
timeFrame: At the end of shift B5, up to 12 hours
measure: Obstructed Vision, A1
timeFrame: At the end of shift A1, up to 12 hours
measure: Obstructed Vision, A2
timeFrame: At the end of shift A2, up to 12 hours
measure: Obstructed Vision, A3
timeFrame: At the end of shift A3, up to 12 hours
measure: Obstructed Vision, A4
timeFrame: At the end of shift A4, up to 12 hours
measure: Obstructed Vision, A5
timeFrame: At the end of shift A5, up to 12 hours
measure: Obstructed Vision, B1
timeFrame: At the end of shift B1, up to 12 hours
measure: Obstructed Vision, B2
timeFrame: At the end of shift B2, up to 12 hours
measure: Obstructed Vision, B3
timeFrame: At the end of shift B3, up to 12 hours
measure: Obstructed Vision, B4
timeFrame: At the end of shift B4, up to 12 hours
measure: Obstructed Vision, B5
timeFrame: At the end of shift B5, up to 12 hours
measure: Interfered Care, A1
timeFrame: At the end of shift A1, up to 12 hours
measure: Interfered Care, A2
timeFrame: At the end of shift A2, up to 12 hours
measure: Interfered Care, A3
timeFrame: At the end of shift A3, up to 12 hours
measure: Interfered Care, A4
timeFrame: At the end of shift A4, up to 12 hours
measure: Interfered Care, A5
timeFrame: At the end of shift A5, up to 12 hours
measure: Interfered Care, B1
timeFrame: At the end of shift B1, up to 12 hours
measure: Interfered Care, B2
timeFrame: At the end of shift B2, up to 12 hours
measure: Interfered Care, B3
timeFrame: At the end of shift B3, up to 12 hours
measure: Interfered Care, B4
timeFrame: At the end of shift B4, up to 12 hours
measure: Interfered Care, B5
timeFrame: At the end of shift B5, up to 12 hours
measure: Irritated Skin, A1
timeFrame: At the end of shift A1, up to 12 hours
measure: Irritated Skin, A2
timeFrame: At the end of shift A2, up to 12 hours
measure: Irritated Skin, A3
timeFrame: At the end of shift A3, up to 12 hours
measure: Irritated Skin, A4
timeFrame: At the end of shift A4, up to 12 hours
measure: Irritated Skin, A5
timeFrame: At the end of shift A5, up to 12 hours
measure: Irritated Skin, B1
timeFrame: At the end of shift B1, up to 12 hours
measure: Irritated Skin, B2
timeFrame: At the end of shift B2, up to 12 hours
measure: Irritated Skin, B3
timeFrame: At the end of shift B3, up to 12 hours
measure: Irritated Skin, B4
timeFrame: At the end of shift B4, up to 12 hours
measure: Irritated Skin, B5
timeFrame: At the end of shift B5, up to 12 hours
measure: Facial Thermal Sensation, A1
timeFrame: At the end of shift A1, up to 12 hours
measure: Facial Thermal Sensation, A2
timeFrame: At the end of shift A2, up to 12 hours
measure: Facial Thermal Sensation, A3
timeFrame: At the end of shift A3, up to 12 hours
measure: Facial Thermal Sensation, A4
timeFrame: At the end of shift A4, up to 12 hours
measure: Facial Thermal Sensation, A5
timeFrame: At the end of shift A5, up to 12 hours
measure: Facial Thermal Sensation, B1
timeFrame: At the end of shift B1, up to 12 hours
measure: Facial Thermal Sensation, B2
timeFrame: At the end of shift B2, up to 12 hours
measure: Facial Thermal Sensation, B3
timeFrame: At the end of shift B3, up to 12 hours
measure: Facial Thermal Sensation, B4
timeFrame: At the end of shift B4, up to 12 hours
measure: Facial Thermal Sensation, B5
timeFrame: At the end of shift B5, up to 12 hours
measure: Body Thermal Sensation, A1
timeFrame: At the end of shift A1, up to 12 hours
measure: Body Thermal Sensation, A2
timeFrame: At the end of shift A2, up to 12 hours
measure: Body Thermal Sensation, A3
timeFrame: At the end of shift A3, up to 12 hours
measure: Body Thermal Sensation, A4
timeFrame: At the end of shift A4, up to 12 hours
measure: Body Thermal Sensation, A5
timeFrame: At the end of shift A5, up to 12 hours
measure: Body Thermal Sensation, B1
timeFrame: At the end of shift B1, up to 12 hours
measure: Body Thermal Sensation, B2
timeFrame: At the end of shift B2, up to 12 hours
measure: Body Thermal Sensation, B3
timeFrame: At the end of shift B3, up to 12 hours
measure: Body Thermal Sensation, B4
timeFrame: At the end of shift B4, up to 12 hours
measure: Body Thermal Sensation, B5
timeFrame: At the end of shift B5, up to 12 hours
measure: Aerosolized Generating Procedures, A1
timeFrame: At the end of shift A1, up to 12 hours
measure: Aerosolized Generating Procedures, A2
timeFrame: At the end of shift A2, up to 12 hours
measure: Aerosolized Generating Procedures, A3
timeFrame: At the end of shift A3, up to 12 hours
measure: Aerosolized Generating Procedures, A4
timeFrame: At the end of shift A4, up to 12 hours
measure: Aerosolized Generating Procedures, A5
timeFrame: At the end of shift A5, up to 12 hours
measure: Aerosolized Generating Procedures, B1
timeFrame: At the end of shift B1, up to 12 hours
measure: Aerosolized Generating Procedures, B2
timeFrame: At the end of shift B2, up to 12 hours
measure: Aerosolized Generating Procedures, B3
timeFrame: At the end of shift B3, up to 12 hours
measure: Aerosolized Generating Procedures, B4
timeFrame: At the end of shift B4, up to 12 hours
measure: Aerosolized Generating Procedures, B5
timeFrame: At the end of shift B5, up to 12 hours
measure: Contact with respiratory/influenza symptoms, A1
timeFrame: At the end of shift A1, up to 12 hours
measure: Contact with respiratory/influenza symptoms, A2
timeFrame: At the end of shift A2, up to 12 hours
measure: Contact with respiratory/influenza symptoms, A3
timeFrame: At the end of shift A3, up to 12 hours
measure: Contact with respiratory/influenza symptoms, A4
timeFrame: At the end of shift A4, up to 12 hours
measure: Contact with respiratory/influenza symptoms, A5
timeFrame: At the end of shift A5, up to 12 hours
measure: Contact with respiratory/influenza symptoms, B1
timeFrame: At the end of shift B1, up to 12 hours
measure: Contact with respiratory/influenza symptoms, B2
timeFrame: At the end of shift B2, up to 12 hours
measure: Contact with respiratory/influenza symptoms, B3
timeFrame: At the end of shift B3, up to 12 hours
measure: Contact with respiratory/influenza symptoms, B4
timeFrame: At the end of shift B4, up to 12 hours
measure: Contact with respiratory/influenza symptoms, B5
timeFrame: At the end of shift B5, up to 12 hours
measure: Number of patients with respiratory/influenza symptoms, A1
timeFrame: At the end of shift A1, up to 12 hours
measure: Number of patients with respiratory/influenza symptoms, A2
timeFrame: At the end of shift A2, up to 12 hours
measure: Number of patients with respiratory/influenza symptoms, A3
timeFrame: At the end of shift A3, up to 12 hours
measure: Number of patients with respiratory/influenza symptoms, A4
timeFrame: At the end of shift A4, up to 12 hours
measure: Number of patients with respiratory/influenza symptoms, A5
timeFrame: At the end of shift A5, up to 12 hours
measure: Number of patients with respiratory/influenza symptoms, B1
timeFrame: At the end of shift B1, up to 12 hours
measure: Number of patients with respiratory/influenza symptoms, B2
timeFrame: At the end of shift B2, up to 12 hours
measure: Number of patients with respiratory/influenza symptoms, B3
timeFrame: At the end of shift B3, up to 12 hours
measure: Number of patients with respiratory/influenza symptoms, B4
timeFrame: At the end of shift B4, up to 12 hours
measure: Number of patients with respiratory/influenza symptoms, B5
timeFrame: At the end of shift B5, up to 12 hours
measure: Estimated duration with patients with respiratory/influenza symptoms, A1
timeFrame: At the end of shift A1, up to 12 hours
measure: Estimated duration with patients with respiratory/influenza symptoms, A2
timeFrame: At the end of shift A2, up to 12 hours
measure: Estimated duration with patients with respiratory/influenza symptoms, A3
timeFrame: At the end of shift A3, up to 12 hours
measure: Estimated duration with patients with respiratory/influenza symptoms, A4
timeFrame: At the end of shift A4, up to 12 hours
measure: Estimated duration with patients with respiratory/influenza symptoms, A5
timeFrame: At the end of shift A5, up to 12 hours
measure: Estimated duration with patients with respiratory/influenza symptoms, B1
timeFrame: At the end of shift B1, up to 12 hours
measure: Estimated duration with patients with respiratory/influenza symptoms, B2
timeFrame: At the end of shift B2, up to 12 hours
measure: Estimated duration with patients with respiratory/influenza symptoms, B3
timeFrame: At the end of shift B3, up to 12 hours
measure: Estimated duration with patients with respiratory/influenza symptoms, B4
timeFrame: At the end of shift B4, up to 12 hours
measure: Estimated duration with patients with respiratory/influenza symptoms, B5
timeFrame: At the end of shift B5, up to 12 hours
measure: Distance between patients with respiratory/influenza symptoms, A1
timeFrame: At the end of shift A1, up to 12 hours
measure: Distance between patients with respiratory/influenza symptoms, A2
timeFrame: At the end of shift A2, up to 12 hours
measure: Distance between patients with respiratory/influenza symptoms, A3
timeFrame: At the end of shift A3, up to 12 hours
measure: Distance between patients with respiratory/influenza symptoms, A4
timeFrame: At the end of shift A4, up to 12 hours
measure: Distance between patients with respiratory/influenza symptoms, A5
timeFrame: At the end of shift A5, up to 12 hours
measure: Distance between patients with respiratory/influenza symptoms, B1
timeFrame: At the end of shift B1, up to 12 hours
measure: Distance between patients with respiratory/influenza symptoms, B2
timeFrame: At the end of shift B2, up to 12 hours
measure: Distance between patients with respiratory/influenza symptoms, B3
timeFrame: At the end of shift B3, up to 12 hours
measure: Distance between patients with respiratory/influenza symptoms, B4
timeFrame: At the end of shift B4, up to 12 hours
measure: Distance between patients with respiratory/influenza symptoms, B5
timeFrame: At the end of shift B5, up to 12 hours
measure: COVID-19, A1
timeFrame: At the end of shift A1, up to 12 hours
measure: COVID-19, A2
timeFrame: At the end of shift A2, up to 12 hours
measure: COVID-19, A3
timeFrame: At the end of shift A3, up to 12 hours
measure: COVID-19, A4
timeFrame: At the end of shift A4, up to 12 hours
measure: COVID-19, A5
timeFrame: At the end of shift A5, up to 12 hours
measure: COVID-19, B1
timeFrame: At the end of shift B1, up to 12 hours
measure: COVID-19, B2
timeFrame: At the end of shift B2, up to 12 hours
measure: COVID-19, B3
timeFrame: At the end of shift B3, up to 12 hours
measure: COVID-19, B4
timeFrame: At the end of shift B4, up to 12 hours
measure: COVID-19, B5
timeFrame: At the end of shift B5, up to 12 hours
measure: Number of COVID-19 patients, A1
timeFrame: At the end of shift A1, up to 12 hours
measure: Number of COVID-19 patients, A2
timeFrame: At the end of shift A2, up to 12 hours
measure: Number of COVID-19 patients, A3
timeFrame: At the end of shift A3, up to 12 hours
measure: Number of COVID-19 patients, A4
timeFrame: At the end of shift A4, up to 12 hours
measure: Number of COVID-19 patients, A5
timeFrame: At the end of shift A5, up to 12 hours
measure: Number of COVID-19 patients, B1
timeFrame: At the end of shift B1, up to 12 hours
measure: Number of COVID-19 patients, B2
timeFrame: At the end of shift B2, up to 12 hours
measure: Number of COVID-19 patients, B3
timeFrame: At the end of shift B3, up to 12 hours
measure: Number of COVID-19 patients, B4
timeFrame: At the end of shift B4, up to 12 hours
measure: Number of COVID-19 patients, B5
timeFrame: At the end of shift B5, up to 12 hours
measure: Completed all 5 study visits (N95 A)
timeFrame: At the end of shift A5, up to 60 hours
measure: Completed all 5 study visits (N95 B)
timeFrame: At the end of shift B5, up to 60 hours
measure: Failed before 5 study visits (N95 A)
timeFrame: At the end of shift A1-A5, up to 60 hours
measure: Failed before 5 study visits (N95 B)
timeFrame: At the end of shift B1-B5, up to 60 hours
measure: Competing event (N95 A)
timeFrame: Between shifts A1-A5, up to 60 hours
measure: Competing event (N95 B)
timeFrame: Between shifts B1-B5, up to 60 hours
Locations:
city: San Francisco
country: United States
facility: University of California, San Francisco
state: California
Study officials:
affiliation: University of California, San Francisco
name: Maria C Raven, MD
role: PRINCIPAL_INVESTIGATOR
References: