Table 2.
Adjusted* Associations of Age of pubertal status (year) with sleep duration (9+ hours versus <9 hours) in Hong Kong’s “Children of 1997” Birth Cohort.
| Age 11–12 OR# (95% CI) | Age 13–14 OR# (95% CI) | Age 17–18 OR# (95% CI) | |
|---|---|---|---|
| Overall | |||
| Age of menarche/voice breaking | 1.05 (0.98, 1.11) | 1.01 (0.94, 1.09) | |
| Onset of Breast/Genitalia | 1.02 (0.96, 1.08) | 1.02 (0.96, 1.09) | 1.05 (0.98, 1.12) |
| Onset of Pubic Hair Development | 1.03 (0.97, 1.10) | 1.04 (0.97, 1.12) | 1.02 (0.93, 1.11) |
| Girls | |||
| Age of menarche/voice breaking | 1.11 (1.01, 1.21) | 1.06 (0.94, 1.18) | |
| Onset of Breast/Genitalia | 1.04 (0.96, 1.13) | 1.02 (0.93, 1.11) | 1.08 (0.99, 1.19) |
| Onset of Pubic Hair Development | 1.06 (0.96, 1.17) | 1.09 (0.98, 1.22) | 1.04 (0.92, 1.18) |
| Boys | |||
| Age of menarche/voice breaking | 1.00 (0.92, 1.10) | 0.97 (0.88, 1.08) | |
| Onset of Breast/Genitalia | 0.995 (0.91, 1.09) | 1.03 (0.95, 1.12) | 0.99 (0.89, 1.11) |
| Onset of Pubic Hair Development | 0.996 (0.90, 1.10) | 1.01 (0.92, 1.10) | 0.98 (0.87, 1.11) |
*Adjusted for parents’ place of birth, highest parental occupation, household income per head and highest parental education levels.
#Odds ratio (OR) per 1-year older age of puberty; thus, a significant OR >1 indicates that older age of puberty is associated with higher odds of longer sleep duration (9+ hours).
Bold font: Statistical significance.