Data source and exposure | Measurement/analysis | Variable format |
---|---|---|
Telephone interview | ||
   Secondhand smoke (SHS) | Validated self-report measure (48) | Dichotomous: <1 vs. ≥1 hour/day |
   Occupational exposure to vapors, gas, dusts, or fumes (VGDF) | Self-report checklist measure (47) | Categoric: compared to employed with no VGDF exposure (ref), and not employed |
Home visit | ||
   Wall dampness | Hand-held moisture meter | Continuous: percent moisture |
   House plants, air filter, wood heating source, dog in home | Check-list | Dichotomous: present vs. absent |
Laboratory measures, from samples collected at home visit | ||
   Total dust | Gravimetric weight | Continuous: bedroom sample |
   Can f1 antigen | ELISA | Continuous: concentration in μg/g dust (maximum of bedroom or living room sample) |
   Anti-Can f1 specific IgE | Immunocap | Dichotomous: elevated (≥25 kU/l) vs. not |
   Endotoxin | Limulus assay | Dichotomous: lowest quartile concentration in EU/mg dust (maximum of bedroom or living room sample) vs. all others |
   Glucan | Sandwich ELISA | Dichotomous: highest quartile concentration in μg/g dust (maximum of bedroom or living room sample) vs. all others |
Metal concentrations (Cu, Fe, Mg, V, Zn) | Aqueous extracts by inductively coupled plasma-mass spectrometry | Dichotomous: highest quartile concentration in μg/g dust (bedroom sample) vs. all others |
Contextual data, matched to residential addresses via geocoding | ||
   Neighborhood socioeconomic characteristics | 2000 Census, measured at the block group level | Continuous: 2 factors derived from principal components analysis of 13 SES variables |
   Land use | U.S. Geological Survey National Land Cover Dataset | Dichotomous: Urban/built environment vs. agricultural/forested |
   Distance from residence to roadway | Tele Atlas/Geographic Data | Continuous: meters to nearest road |
 | Technology Dynamap database | Continuous: km to nearest major road |
   Air quality | Air pollution: CA Air Resources Board Air Quality Data, Environmental Protection Agency Air Quality Data Retrieval System | Continuous: 2 factors derived from principal components analysis of 8 variables: (ozone, PM2.5, PM10-2.5, NO2, summer and winter temperatures and wind speeds) |
 | Climate: Bay Area Air Quality Management District, National Weather Service |  |