Table 1.
Selected cohort characteristics
| Characteristic | Included n=192 |
Excluded† n=539 |
p-value |
|---|---|---|---|
| Mother’s agea | 24 (21-29) | 24 (21-29) | 0.395 |
| Child’s agea | 9.0 (9.0-9.2) | 8.1 (5.8,10) | <0.001 |
| Child’s race/ethnicity | <0.001 | ||
| African American (%) |
48 | 30 | |
| Dominican (%) |
52 | 70 | |
| Maternal educationb (%) |
64 | 64 | 0.903 |
| Maternal asthmac (%) |
28 | 24 | 0.295 |
| Child’s sex (% male) |
41 | 51 | 0.021 |
| Prenatal ETSd exposure (%) |
42 | 32 | 0.013 |
Median (25th-75th percentiles), Mann Whitney U test
Mother completed high school, General Educational Development (GED) test or greater
Mother reported asthma in prenatal or 3 month questionnaire.
Prenatal ETS exposure defined as maternal or cord blood cotinine level ≥ 15 ng/ml or report of smoker in the home from prenatal questionnaire. #Differences in categorical variables tested using Pearson Chi-Square
333/727 (45.8%) children excluded because they had not yet reached at least age 9 by June 24th, 2010, the last day of available central site monitoring data.
169/394 (42.9 %) children were excluded because they did not have available FENO data. 3/225 (1.3%) were excluded due to ambient NO levels greater than 100 ppb and the potential for contamination from ambient NO.
30/222 (13.5%) were excluded because they resided outside of study catchment area.