Table 1.
Sample Description and Associations with Nighttime Sleep Duration (n = 240)
| Nighttime sleep duration (hours) | ||||
|---|---|---|---|---|
| Mean (range) or % | r (p) | Mean | t or F (p) | |
| Nighttime sleep duration (hours) | 9.1 (5.5–13.0) | — | — | — |
| Daytime sleep duration (hours) | 2.6 (0–7.4) | −0.08 (0.194) | ||
| Toddler | ||||
| Age, months | 20.2 (11.9–31.9) | 0.01 (0.838) | — | — |
| Sex | ||||
| Male, % | 55.0 | — | 9.1 | 0.21 (0.838) |
| Female, % | 45.0 | — | 9.1 | |
| Race/ethnicity | ||||
| Black, % | 68.8 | — | 8.8 | 20.9 (<0.001) |
| White, % | 22.9 | 10.1 | ||
| Other, % | 8.3 | — | 9.5 | |
| Physical activity | ||||
| Minutes/day in MVPA | 55.4 (0–192) | 0.193 (0.012) | — | — |
| Activity counts/minute | 390.3 (89–913) | 0.212 (0.006) | — | — |
| Diet | ||||
| Diet quality: total HEI-2005 score | 55.4 (24.0–84.0) | 0.127 (0.062) | — | — |
| Energy (kcals) | 1288.0 (330–3049) | 0.019 (0.784) | ||
| Weight status | ||||
| Weight-for-length z-score | 0.17 (−3.0 to 3.8) | −0.092 (0.131) | — | — |
| Healthy weight (<95th percentile) | 87.4 | — | 9.2 | 2.78 (0.006) |
| Obese (≥95th percentile) | 12.6 | — | 8.5 | |
| Mother | ||||
| Age, years | 27.1 (18.1–46.3) | 0.12 (0.057) | — | — |
| Marital status | ||||
| Married, % | 28.0 | — | 9.7 | 3.71 |
| Not married, % | 72.0 | — | 8.9 | (<0.001) |
| Employment status | 61.3 | — | 9.2 | 1.3 (0.194) |
| Unemployed, % | 38.7 | — | 9.0 | |
| Employed, % | ||||
| Poverty | ||||
| Poverty ratio | 0.82 (0.1–3.2) | 0.20 (0.002) | — | |
| Below poverty threshold | 68.1 | — | 9.5 | 3.1 (0.002) |
| At/above poverty threshold | 31.9 | — | 8.9 | |
| Recruitment location | ||||
| Urban | 58.8 | — | 8.9 | 3.6 (<0.001) |
| Suburban | 41.3 | — | 9.5 | |
HEI-2005, Healthy Eating Index 2005; MVPA, moderate-to-vigorous physical activity.