| http://www.w3.org/ns/prov#value | - All of the covariates except age (which varies little)are significantly associated with BMI. Repeating the adjustedcross-sectional model with baseline BMI and covariatesyields a similar association: ?0.81 kg/m2per sleep level(95% confidence interval (CI): ?1.58, ?0.05; P ?? 0.04)(results not shown).The association between sleep duration and BMI doesnot vary significantly by race-sex groups (F ?? 1
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