Association of Nighttime Sleep Duration at 1.5 Years With Height at 3 Years: The Japan Environment and Children's Study
Authors' conclusion
This study underscores the importance of nighttime sleep duration, not total sleep duration, in the linear growth of very young children.
Study context
- Population
- Term singleton births, appropriate-for-gestational age, without background disorders that could affect linear growth; Japan Environment and Children's Study
- Participants
- 52,140 births
- Exposure
- Nighttime sleep duration categories at 1.5 years vs ≤9 hours
- Outcome
- Tall stature (height ≥75th percentile among participants)
- Follow-up
- 3 years
Methodological detailsnationwide, multivariate adjusted
- Nationwide
- Multivariate adjusted
Main finding
As reported in the abstract
Tall stature
Each group vs ≤ 9 hoursMultivariate OR (95% CI)P value
9.5 or 10 hours
1.09(1.01–1.17)
10.5 or 11 hours
1.09(1.01–1.17)
≥ 11.5 hours
1.25(1.14–1.37)
P < 0.0001for trendObservational data: associations, not effects.
Further findings
- Total sleep duration was not associated with tall stature
Original publication
Association of Nighttime Sleep Duration at 1.5 Years With Height at 3 Years: The Japan Environment and Children's Study. J Clin Endocrinol Metab. Published 17 September 2024. doi:10.
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