TY - JOUR
T1 - Sex differences in the association between sleep and body mass index in adolescents
AU - Knutson, Kristen L.
PY - 2005/12/1
Y1 - 2005/12/1
N2 - Objective: To determine whether an association between short sleep duration and increased body mass index (BMI) exists in a sample of U.S. adolescents. Study design: Public-use dataset of the National Longitudinal Study of Adolescent Health. Final sample included 4486 adolescents (51% female). Main outcome was BMI transformed into z-scores for age and sex using reference values from the Centers for Disease Control/National Center for Health Statistics. Overweight was defined as ≥95 th percentile. Linear and logistic regression models were calculated. Sleep duration was self-reported in hours. A quadratic term for sleep was added to test curvilinear association. Covariates included age, race, parental education, activity and inactivity scores. Results: Among males, linear regression indicated that sleep duration significantly predicted BMI z-score (Beta = -0.08, 95% CI: -0.12, -0.03). Logistic regression indicated that sleep duration predicted risk of overweight among males (OR = 0.90, 95% CI: 0.82, 1.00). Sleep duration was not a significant predictor among females in either regression model. Quadratic term for sleep was not significant for either sex. Conclusions: Longer sleep duration was weakly associated with lower BMI and risk of overweight among male adolescents only. This sex-related difference may be due to differences in the physiology of puberty or in sleep characteristics.
AB - Objective: To determine whether an association between short sleep duration and increased body mass index (BMI) exists in a sample of U.S. adolescents. Study design: Public-use dataset of the National Longitudinal Study of Adolescent Health. Final sample included 4486 adolescents (51% female). Main outcome was BMI transformed into z-scores for age and sex using reference values from the Centers for Disease Control/National Center for Health Statistics. Overweight was defined as ≥95 th percentile. Linear and logistic regression models were calculated. Sleep duration was self-reported in hours. A quadratic term for sleep was added to test curvilinear association. Covariates included age, race, parental education, activity and inactivity scores. Results: Among males, linear regression indicated that sleep duration significantly predicted BMI z-score (Beta = -0.08, 95% CI: -0.12, -0.03). Logistic regression indicated that sleep duration predicted risk of overweight among males (OR = 0.90, 95% CI: 0.82, 1.00). Sleep duration was not a significant predictor among females in either regression model. Quadratic term for sleep was not significant for either sex. Conclusions: Longer sleep duration was weakly associated with lower BMI and risk of overweight among male adolescents only. This sex-related difference may be due to differences in the physiology of puberty or in sleep characteristics.
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U2 - 10.1016/j.jpeds.2005.07.019
DO - 10.1016/j.jpeds.2005.07.019
M3 - Article
C2 - 16356441
AN - SCOPUS:28844442778
SN - 0022-3476
VL - 147
SP - 830
EP - 834
JO - Journal of Pediatrics
JF - Journal of Pediatrics
IS - 6
ER -