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.

From: Age of puberty and Sleep duration: Observational and Mendelian randomization study

 

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)

  1. *Adjusted for parents’ place of birth, highest parental occupation, household income per head and highest parental education levels.
  2. #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).
  3. Bold font: Statistical significance.
Back to article page