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Association between indoor light at night and obesity among children and adolescents at different physical activity levels: a population-based cross-sectional study
Indoor light at night linked to obesity in children and teens with different activity levels
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Abstract
Median indoor light exposure at night was 2.4 lx, with 72.1% of participants experiencing more than 1 lx.
- Each standard deviation increase of indoor light exposure (12.3 lx) is associated with a 0.34 increase in , 0.49 kg increase in , and 0.26 kg increase in fat mass tissue.
- Extended exposure to light at night by 67.0 minutes per day is related to an increase of 0.42 in BMI and 0.72 cm increase in waist circumference.
- Duration of nighttime light exposure of 1 lx or more is significantly associated with obesity, with an odds ratio of 1.27.
- Associations between light exposure and obesity parameters were not observed in participants engaging in moderate-to-vigorous physical activity for 1 hour or more per day.
- A positive correlation between light exposure and obesity-related metrics exists in participants with less than 1 hour of moderate-to-vigorous physical activity, but lacks statistical significance.
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Key numbers
0.34
Increase in per SD increase in
Each SD (12.3 lx) increase in indoor exposure
0.72 cm
Increase in waist circumference per SD increase in duration
Extended exposure to ≥ 1 lx by 67.0 min/day
1.27
Odds ratio for obesity per SD increase in duration
Each SD increase in duration is significantly associated with obesity