Please select the eligibility criteria that correspond to the clinical trial below.
Title: Reducing Sedentary Behavior to Decrease Low Back Pain: Stand Back Study
Brief Summary: This study will test the effects of a sedentary behavior intervention on low back pain in working adults. The behavioral intervention will include the use of a sit-stand desk and a wrist-worn activity prompter that will notify participants when they have been sedentary for too long.


Options:
A: Inclusion Criteria:

* full-time member of staff
* access to a work telephone and desktop computer with internet

Exclusion Criteria:

* have a cardiovascular or metabolic disease
* taking any medication
* pregnant
* planned absence \> 1 week during the trial
B: Inclusion Criteria:

* We will recruit overweight/obese (body mass index 25.0-40.0 kg/m2) adults (18-65 years) working in full-time (minimum 35 hours/week), sedentary (self-report sitting \>75% work time) occupations at an independent work site.

Exclusion Criteria:

* Working in an office that will not meet the space or electrical requirements of the active workstation, acute or chronic illness not under treatment of a provider, orthopedic limitations that prohibit physical activity, current or planned pregnancy, hospitalization from a physical or mental disorder in the past six months and/or taking medication that may impair physical activity
C: Inclusion Criteria:

1. Workplaces should be:

   * Office-based with sedentary workers
   * Able to include four sections of about equal size (about 25 people) and which could be separated to minimize spill-over effects (e.g. four different addresses, buildings or floors).
   * Have a management willing to collaborate about the project by participating at meetings and at kick-off.
   * Should have at least some financial resources to make structural changes at the work place.
2. Individuals should be:

   * Adults \>18 years
   * Sedentary office-based work-
   * Understanding of Danish
   * Without sickness or disabilities affecting their ability to stand or walk
   * Not pregnant
   * Working more than 4 days a week (\>30 h)

Exclusion Criteria:

* Not providing signed informed consent.
D: Inclusion Criteria:

1. Have chronic low back pain defined as a back pain problem that has persisted at least 3 months and has resulted in pain on at least half the days in the past 6 months
2. Oswestry low back pain index \>20% to ensure a moderate level of disability is present, thus minimizing a potential floor effect
3. Currently perform deskwork at least 20 hours per week at a desk compatible with the sit-stand attachment
4. Stable employment (at least 3 months at current job and plan to stay at current job for the next 6 months)
5. Ability to obtain approval to install sit-stand workstation (i.e., from supervisor)
6. Access to internet connection and email to complete assessment surveys

Exclusion Criteria:

1. Unable to provide informed consent
2. Cardiovascular event in the last 6 months (e.g. heart attack, stoke, heart failure, revascularization procedure)
3. Presence of a comorbid condition that would limit ability to reduce sedentary behavior (e.g. currently undergoing treatment for cancer)
4. Back surgery in the past 3 months or planned in the next year
5. Presence of a medical "red flag" for a serious spinal condition (cancer, compression fracture, signs or symptoms of root compression, infection)
6. Inability to tolerate standing for any reason
7. Currently using a sit-stand desk, standing desk, or wearable activity monitor
8. Currently pregnant or planned pregnancy in the next 6 months
9. Blood pressure \>159/100 mmHg

Answer: D