Birth Weight, School Sports Ability, and Adulthood Leisure-Time Physical Activity.

Purpose: To examine the associations of birth weight with ability in school sports in adolescence and participation in leisure-time physical activity (LTPA) across adulthood, and to investigate whether associations between birth weight and LTPA change with age. Methods: Study participants were British singletons born in 1946 and followed-up to age 68 (the MRC National Survey of Health and Development). Birth weights were extracted from birth records. Teacher reports of ability in school sports were collected at age 13 years. LTPA was self-reported at ages 36, 43, 53, 60-64 and 68 years and categorised at each age as participating in sports, exercise and other vigorous LTPA at least once per month versus no participation. Associations were examined using standard and mixed-effects logistic regression models. Results: Relevant data were available for 2,739 study participants (50.1% female). When compared with the low birth weight group (

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