Table 1.
Distribution of demographic and environmental exposures in the Children’s Healthy Study.
| Sleep duration (hours) | ||||
|---|---|---|---|---|
| ≥8 hours | <8 hours | |||
| N | % | N | % | |
| Sex | ||||
| Male | 469 | 49.5% | 240 | 45.4% |
| Female | 478 | 50.5% | 289 | 54.6% |
| Age (years; SD) | 13.42 | 0.6 | 13.48 | 0.63 |
| Race/ethnicity | ||||
| Asian | 39 | 4.1% | 28 | 5.3% |
| Black | 13 | 1.4% | 10 | 1.9% |
| Hispanic | 500 | 52.8% | 312 | 59.0% |
| Mixed | 48 | 5.1% | 29 | 5.5% |
| Unknown/missing | 20 | 2.1% | 14 | 2.6% |
| White | 327 | 34.5% | 136 | 25.7% |
| Maternal education | ||||
| Less than college | 584 | 61.7% | 378 | 71.5% |
| College graduate | 294 | 31.0% | 119 | 22.5% |
| Missing | 69 | 7.3% | 32 | 6.0% |
| Community (row %) | ||||
| Anaheim | 79 | 53.7% | 68 | 46.3% |
| Glendora | 179 | 71.9% | 70 | 28.1% |
| Long Beach | 51 | 54.3% | 43 | 45.7% |
| Mira Loma | 114 | 55.3% | 92 | 44.7% |
| Riverside | 96 | 64.4% | 53 | 35.6% |
| Santa Barbara | 153 | 72.9% | 57 | 27.1% |
| San Dimas | 133 | 63.6% | 76 | 36.4% |
| Upland | 142 | 67.0% | 70 | 33.0% |
| Exposed to secondhand smoke | 69 | 7.3% | 56 | 10.6% |
| Stress (PSS-4 score; SD) | 5.2 | 3 | 6.8 | 3 |
| Exposures, median (IQR) | ||||
| Greenspace (EVI) | 0.21 | 0.18–0.24 | 0.20 | 0.17–0.22 |
| Light at night (mcd/m2) | 3.5 | 2.5–4.1 | 3.7 | 3.1–4.6 |
| Nighttime noise (dB) | 45.7 | 41.0–51.5 | 47 | 41.2–46.8 |
| Freeway NOx (ppb) | 7.6 | 4.0–14.9 | 8.8 | 5.5–14.4 |
| Regional PM2.5 (μg/m3) | 14.4 | 14.0–15.7 | 14.8 | 14.2–16.2 |