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Chronic disease
SP1-12 Relationship between sleep duration at 3 years of age and growth during childhood: a multi-level analysis
  1. K Suzuki1,
  2. A Takahashi2,
  3. M Sato2,
  4. N Kondo2,
  5. T Tanaka2,
  6. A Nagai2,
  7. Z Yamagata1,2
  1. 1Center for Birth Cohort Studies, Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi, Chuo, Yamanashi, Japan
  2. 2Department of Health Sciences, Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi, Chuo, Yamanashi, Japan

Abstract

Introduction Short sleep duration in early life has been thought to be a risk factor for subsequent overweight. This study aimed to examine the relationship between sleep duration at 3 years of age and childhood weight status through a multi-level analysis.

Methods The study population comprised children born between 1 April 1991, and 31 March 2003, in Koshu City, Japan, and who participated in a medical check-up at 3 years of age. Short and long sleep durations at 3 years of age were the exposures studied. We compared the trajectory of body mass index (BMI) z-scores from 3 to 9 years of age in exposed and non-exposed participants. Random intercepts and slopes model (SAS Proc Mixed) was used for statistical analysis.

Results Of 1794 children who participated in a medical check-up at 3 years of age, 1640 (91.4%) were not over-weight at 3 years and were followed-up until they were 9 or 10 years old. The number of children in each category of sleep duration, that is, ≤9 h, 9–10 h, 10–11 h, and ≥11 h, was 66 (3.7%), 609 (34.0%), 847 (47.2%), and 271 (15.1%), respectively. BMI z-scores increased with increase in age (p=0.03) for boys with a short sleep duration (<9 h). On the other hand, sleep duration was not significantly associated with BMI z-score in girls.

Conclusion It was suggested that there is gender difference of the effect of childhood sleep duration on subsequent overweight.

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