Table 1.
Sample characteristics, by randomization status
| Variable | Overall (n=774) | Randomized (n=448) | Nonrandomized (n=326) | P Value |
|---|---|---|---|---|
| Age | 7.13 (1.41) | 7.02 (1.40) | 7.28 (1.42) | 0.010 |
| Sex, male | 367 (47.5%) (n = 773) | 216 (48.2%) (n = 325) | 151 (46.5%) | 0.66 |
| Race, African American | 433 (57.7%) (n = 750) | 247 (56.7%) (n = 436) | 186 (59.2%) (n = 314) | 0.50 |
| Ethnicity, Hispanic | 60 (7.8%) (n = 772) | 37 (8.3%) | 23 (7.1%) (n = 324) | 0.59 |
| BMI z-score | 0.91 (1.25) (n = 753) | 0.87 (1.32) | 0.98 (1.15) (n = 305) | 0.35 |
| AHI | 5.70 (8.34) | 6.79 (5.66) | 4.21 (10.84) | <0.0001 |
| Poverty rate (%) | 21.09 (16.35) | 21.46 (16.9) | 20.57 (15.57) | 0.82 |
| Percentage of single-female–headed households with children | 21.3 (15.29), | 21.66 (16.29) | 20.81 (13.81) | 0.90 |
| Unemployment rate (%) | 34.28 (15.35) | 33.76 (15.42) | 34.98 (15.24) | 0.22 |
| High school dropout rate (%) | 6.08 (9.39) | 6.31 (9.77) | 5.75 (8.85) | 0.71 |
| Linear distance to nearest major road, mi | 0.76 (0.88) (n = 532) | 0.81 (1.02) (n = 264) | 0.72 (0.71) (n = 268) | 0.59 |
| Travel distance to nearest major road, mi | 3.23 (2.72) (n = 532) | 3.17 (2.88) (n = 264) | 3.29 (2.54) (n = 268) | 0.13 |
| Severe neighborhood distress, yes (%)* | 192 (24.8%) | 108 (24.1%) | 84 (25.8%) | 0.61 |
Definition of abbreviations: AHI = apnea–hypopnea index; BMI = body mass index.
For continuous variables, mean (SD) values are provided, and Wilcoxon rank sum tests were performed. For categorical variables, column percent values are provided, and Fisher’s exact tests were performed. In the presence of missing data, actual sample sizes for available data were included.
*
See text for definition.