DOI: 10.3886/icpsr38683.v1
title: Los Angeles Family and Neighborhood Survey (L.A.FANS), Wave 2, Biomarker Data, 2006-2008
title: Version 1

description: The Los Angeles Family and Neighborhood Survey (L.A.FANS) is a two-wave study of adults and children in Los Angeles County and of the neighborhoods in which they live. The first wave (L.A.FANS-1), which was fielded between April 2000 and January 2002, interviewed adults and children living in 3,085 households in a stratified probability sample of 65 neighborhoods throughout Los Angeles County. The samples of neighborhoods and individuals were representative of neighborhoods and residents of Los Angeles County. Poorer neighborhoods and households with children were oversampled. In Wave 2 of L.A.FANS (L.A.FANS-2), Wave 1 respondents living in Los Angeles County were reinterviewed and updated information was collected on Wave 1 respondents who had moved away from Los Angeles County. A sample of individuals who moved into each sampled neighborhood between Waves 1 and 2 was also interviewed, for a total of 2,319 adults and 1,382 children (ages less than 18 years).
A new feature in L.A.FANS-2 was the collection of physiological health measures. Interviewers collected blood pressure, pulse, height, weight, hip and waist circumference, and a pulmonary function assessment (spirometry) from respondents. Saliva samples were collected from child respondents. 50% of L.A.FANS households were selected at random and respondents were asked to provide dried blood spot (DBS) samples. The initial release of L.A.FANS-2 data included only the blood pressure and anthropometry data. This collection contains the spirometry, saliva, and DBS data. The saliva and DBS datasets each have one record per respondent who completed the health module, while the spirometry dataset has one record for each trial.
Data in this study are designed for use with the public use data files for L.A.FANS, Wave 1 (study 1) and Wave 2 (study 2). Additional information on the project is available on the L.A.FANS series page and the RAND website.
Additional information on the project, survey design, sample, and variables are available from:

Sastry, Narayan, Bonnie Ghosh-Dastidar, John Adams, and Anne R. Pebley (2006). The Design of a Multilevel Survey of Children, Families, and Communities: The Los Angeles Family and Neighborhood Survey, Social Science Research, Volume 35, Number 4, Pages 1000-1024
The Users' Guides (Wave 1 and Wave 2)
 RAND Documentation Reports page
description: All respondents ages 5 years and older were eligible to be screened for pulmonary function testing during their L.A.FANS-2 study visit. For each respondent, one spirometry trial consisted of taking in the deepest breath possible followed by one forceful exhalation into the spirometer long enough to completely empty the lungs. A spirometry session was a minimum of three trials with brief rest periods of at least 30 seconds in between.
Child respondents age 3 to 17, with permission from a parent/guardian, were invited to participate in saliva collection for cortisol analysis. Children's primary caregivers were instructed to collect or supervise the sample collection following the L.A.FANS-2 study visit at three specific times over one calendar day: 1) immediately upon waking, 2) 30 minutes after the first collection began, and 3) at bedtime.
Due to budget constraints, only a subset (approximately 50%) of adults, children, and siblings were selected for dried blood spot (DBS) testing. At the end of their L.A.FANS-2 study interview visit, participants were screened and, if eligible and consenting, were directed to schedule sample collection during a separate visit. DBS samples were analyzed for total cholesterol, high density lipoprotein (HDL), and hemoglobin A1C.
description: For dried blood spot (DBS) data for adults and children, measures include total cholesterol, HDL cholesterol, C-reactive protein, and Epstein-Barr virus concentration. For children's saliva data, cortisol levels are measured for each of the three samples collected. For spirometry data, measures include peak expiratory flow, forced expiratory volume (FEV) after 1 second, and FEV after six seconds. Demographic variables include sex and age.
description: Dried blood spot (DBS) data: Non-response weights were created for children that had DBS results. Depending on the sample of children being studied, these weights should be used in DBS data analyses:

<strong>PWGT_RSCSIB_DBS</strong>: DBS panel weight for child respondents and siblings
<strong>XWGT_RSCSIB_LAF_DBS</strong>: DBS cross-section weight for child respondents and siblings in the 65 L.A.FANS census tracts
<strong>XWGT_RSCSIB_LAC_DBS</strong>: DBS cross-section weight for child respondents and siblings in Los Angeles County

Saliva data: Non-response weights were created for the children for whom saliva results were returned. Depending on the sample of children being studied, these weights should be used in saliva data analyses:

<strong>PWGT_RSCSIB_SAL</strong>: Saliva panel weight for child respondents and siblings
<strong>XWGT_RSCSIB_LAF_SAL</strong>: Saliva cross-section weight for child respondents and siblings in the 65 L.A.FANS census tracts
<strong>XWGT_RSCSIB_LAC_SAL</strong>: Saliva cross-section weight for child respondents and siblings in Los Angeles County
description: Response Rates: Dried blood spot (DBS) data: 708 child and 975 adult respondents were selected for the DBS sample (primary caregivers were excluded), and 569 (80.4%) children and 753 (77.2%) adults were eligible and consented. Among the 222 adults who did not have a visit scheduled, 163 refused, 49 could not be contacted, and 10 could not continue due to health-related issues. Of the 139 children with no visit scheduled, 92 refused, 31 could not be contacted, 10 could not continue due to health-related issues, and 6 were too young. For participants that had a scheduled sample collection visit, 450 (79.1%) children and 581 (77.2%) adults had a successful sample collection and processing. Lab results were not returned for 119 children and 172 adults who were eligible and agreed to schedule a visit due to refusals, incorrect contact information, had not returned scheduling calls, or were not home for the visit.
Saliva sample data: Of the 1,264 children completed the health measures module, 1,175 were eligible and consented to provide samples. Eighty-nine children were not given a kit due to refusals (55), blood pressure alert (22), or were under age three (12). Of those eligible, 579 (49.3%) returned results, and 466 (80.5% of returned; 39.7% of eligible) had sufficient samples.
Spirometry data: 1,209 children age 5 and up and 2,061 adults participated in the health measures module. Twenty (1.7%) children and 86 (4.2%) adults refused the test. Of those who initially agreed, 36 (3%) children and 52 (2.6%) adults were deemed ineligible for health-related reasons, resulting in 1,153 children and 1,932 adults eligible. Of those, 1,127 (97.8%) children and 1,850 (96.2%) adults had at least one successful trial output.
description: L.A.FANS is based on a stratified random sample of 65 neighborhoods (census tracts) in Los Angeles County, California. Poor neighborhoods were oversampled. In Wave 1, an average of 41 households were randomly selected and interviewed within each neighborhood, including an oversample of households with children under 18. Within each household, both adults and children were sampled and interviewed. Each sampled person was interviewed in the first wave and tracked and reinterviewed in the second wave, whether they remained in the neighborhood or moved elsewhere in Los Angeles County. Information on Wave 1 respondents who could not be reinterviewed in Wave 2 was collected from other household members. In the second wave, a fresh sample of households that had moved into the neighborhood in period between waves was also selected and interviewed. The first wave (L.A.FANS-1), which was fielded between April 2000 and January 2002, interviewed adults and children living in 3,085 households in a stratified probability sample of 65 neighborhoods throughout Los Angeles County. The samples of neighborhoods and individuals were representative of neighborhoods and residents of Los Angeles County. Poorer neighborhoods and households with children were oversampled. In Wave 2 of L.A.FANS (L.A.FANS-2), Wave 1 respondents living in Los Angeles County were reinterviewed and updated information was collected on Wave 1 respondents who had moved away from Los Angeles County. A sample of individuals who moved into each sampled neighborhood between Waves 1 and 2 was also interviewed, for a total of 2,319 adults and 1,382 children (ages less than 18 years). Additional information on the project is available at the L.A.FANS website.
description: Datasets: 
DS0: Study-Level Files
DS1: Adult Dried Blood Spot Data
DS2: Children Dried Blood Spot and Saliva Data
DS3: Spirometry Trials Data
description: Households in Los Angeles County. Smallest Geographic Unit: County
description: coded on-site observationL.A.FANS User Guides and Questionnaires are available to read or download from the L.A.FANS website. For additional information, please visit the L.A.FANS website.