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- Title
Bedtime, body mass index and obesity risk in preschool‐aged children.
- Authors
Roy, Melyssa; Haszard, Jillian J.; Savage, Jennifer S.; Yolton, Kimberly; Beebe, Dean W.; Xu, Yingying; Galland, Barbara; Paul, Ian M.; Mindell, Jodi A.; Mihrshahi, Seema; Wen, Li Ming; Taylor, Barry; Richards, Rosalina; Te Morenga, Lisa; Taylor, Rachael W.
- Abstract
Summary: Background: Although sleep duration is a risk factor for obesity in young children, less is known about other aspects of sleep health, including bedtime, on obesity risk. Objective: To determine whether bedtime is associated with body mass index (BMI) z‐score or obesity risk in children ages 2 to 5 years, and to determine if associations are independent of sleep duration. Methods: Cohort analyses were undertaken using three early life obesity prevention trials (POI, INSIGHT, Healthy Beginnings) and a longitudinal cohort study (HOME). Bedtime was assessed by questionnaire and BMI through clinical measurement between 2 and 5 years in 1642 children. Adjusted regression models examined whether BMI z‐score and obesity (BMI z‐score ≥ 2) were associated with bedtime, nocturnal sleep time and 24‐hour sleep time. A discrete mixture model categorized children into bedtime trajectory groups across time points. Results: Bedtime was inconsistently associated with BMI z‐score. Although each hour later of bedtime was associated with greater odds of obesity at ages 3 (OR; 95% CI: 1.05; 1.003, 1.10) and 5 (1.35; 1.08, 1.69) years, odds were attenuated after adjustment for nocturnal or 24‐hour sleep time. Longer nocturnal sleep duration at 2 years was associated with lower odds of obesity (OR 0.90; 0.86, 0.94), as was longer 24‐hour sleep duration at 3 years in girls (0.70; 0.62, 0.78). BMI z‐score and odds of obesity were not significantly different between 'early to bed' and 'late to bed' trajectory groups. Conclusions: Timing of bedtime appears inconsistently related to obesity in young children, possibly via influencing overall sleep duration.
- Subjects
RISK of childhood obesity; CONFIDENCE intervals; LONGITUDINAL method; QUESTIONNAIRES; REGRESSION analysis; RISK assessment; SLEEP; TIME; BODY mass index; ODDS ratio
- Publication
Pediatric Obesity, 2020, Vol 15, Issue 9, p1
- ISSN
2047-6302
- Publication type
Article
- DOI
10.1111/ijpo.12650