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Relationship between time-varying exposures (body mass index (BMI; weight (kg)/height (m)2) and physical activity), the outcome (current asthma), and time-varying covariates (age, education, diet, menopause, smoking status, ever having an asthma attack) in a study of body composition, physical activity, and current asthma, Asthma-E3N Study, 2000–2011. E3N, Etude Epidémiologique auprès de Femmes de la Mutuelle Générale de l'Education Nationale.
