Table 3.
The relationships of short sleep and late bedtime with risk of developing overweight or obesity amongst adolescents with normal weight at baseline (n = 411).
| Overweight or obesity during follow-up | Obesity during follow-up | |||
|---|---|---|---|---|
| Baseline sleep duration | ||||
| Weekly average sleep duration ≥7 hours | 9.8% (7.0–13.4) | 5.6% (3.7–8.3) | ||
| Weekly average sleep duration <7 hours | 13.8% (3.9–31.7) | 6.7% (0.8–22.1) | ||
| Unadjusted RR (95% CI) | 1.40 (0.54–3.67) | p = 0.491 | 1.18 (0.29–4.76) | p = 0.815 |
| Age- and sex-adjusted RR (95% CI) | 1.30 (0.48–3.47) | p = 0.608 | 1.27 (0.29–5.50) | p = 0.748 |
| Baseline bedtime | ||||
| Weekly average bedtime ≤0:00 (midnight) | 9.3% (6.4–13.0) | 5.8% (3.7–8.6) | ||
| Weekly average bedtime >0:00 (midnight) | 13.7% (6.8–23.8) | 5.3% (1.5–12.9) | ||
| Unadjusted RR (95% CI) | 1.48 (0.76–2.88) | p = 0.255 | 0.91 (0.32–2.56) | p = 0.857 |
| Age- and sex-adjusted RR (95% CI) | 1.46 (0.70–3.05) | p = 0.310 | 0.93 (0.30–2.87) | p = 0.901 |
Footnotes: Data are presented as prevalence (%) or relative risk (RR) with 95% confidence interval (CI). Relative risk was defined as risk of developing overweight or obesity during follow-up in adolescents with short sleep (or late bedtime), compared to those without a history of short sleep (or late bedtime).