Table 1.
Percentage of participants reporting shorter sleep by family characteristics and logistic regression models predicting shorter night-time sleep.
| Risk factors | Shorter sleep | Model 1 | Model 2 |
|---|---|---|---|
| (<11 h) | (Simple logistic regression) | (Multiple logistic regression) | |
| n (%) | OR (95% CI) | OR (95% CI) | |
| Total (n = 1702) | 240 (14.1) | ||
| Maternal education | |||
| High (n = 964) | 108 (11.2) | 1.00 | 1.00 |
| Low (n = 735) | 132 (17.9) | 1.64 (1.23–2.17)⁎⁎ | 1.46 (1.07–1.99)⁎ |
| Ethnicity | |||
| White (n = 1615) | 200 (12.4) | 1.00 | 1.00 |
| Non-white (n = 87) | 40 (46.0) | 5.10 (3.16–8.24)⁎⁎ | 5.05 (3.08–8.27)⁎⁎ |
| Sex | |||
| Female (n = 874) | 104 (11.9) | 1.00 | 1.00 |
| Male (n = 828) | 136 (16.4) | 1.45 (1.08–1.92)⁎ | 1.61 (1.19–2.17)⁎ |
| Birth weight (g) | |||
| >2500 (n = 858) | 105 (12.2) | 1.00 | 1.00 |
| ⩽2500 (n = 844) | 135 (16.0) | 1.43 (1.07–1.90)⁎ | 1.45 (1.07–1.96)⁎ |
| Older children | |||
| 0 (n = 889) | 121 (13.6) | 1.00 | 1.00 |
| 1 (n = 563) | 66 (11.7) | 0.84 (0.61–1.17) | 0.83 (0.58–1.17) |
| >1 (n = 250) | 53 (21.2) | 1.70 (1.17–2.47)⁎ | 1.58 (1.06–2.35)⁎ |
| Morning TV (h) | |||
| ⩽1 (n = 1176) | 141 (12.0) | 1.00 | 1.00 |
| >1 (n = 526) | 99 (18.8) | 1.47 (1.10–1.96)⁎ | 1.13 (0.80–1.58) |
| Evening TV (h) | |||
| ⩽1 (n = 1489) | 183 (12.3) | 1.00 | 1.00 |
| >1 (n = 213) | 57 (26.8) | 2.22 (1.55–3.18)⁎⁎ | 1.89 (1.26–2.84)⁎ |
| Mediators | |||
| Wake time (per hour) | – | 0.22 (0.17–0.29)⁎⁎ | – |
| Bedtime (per hour) | – | 6.04 (4.72–7.72)⁎⁎ | – |
Abbreviations: OR, odds ratio; CI, confidence interval.
Model 2 is a multiple logistic regression model containing all risk factors predicting shorter sleep. All models adjusted for age, daytime sleep and regular night waking.
⁎
p < 0.05.
⁎⁎
p ⩽ 0.001.