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Data on eating disorder behaviours at age 14 years were collected using questions adapted from the Youth Risk Behavior Surveillance System questionnaire, enquiring about the previous year.
Gender, race, and age (in years) were collected using the Socio-demographic Questionnaire developed by the Center for Research in Chronic Disorders, University of Pittsburgh School of Nursing (1999) and administered through the Clinical Trials Database.
Data on alcohol use in early adolescence (age 13 years) and late adolescence (age 18 years) were collected using self-completed pen and paper and self-completed computer-based questionnaires, respectively.
Self-reported height and weight at approximately age 20 years were collected using standardised personal interviews (University of Southern California Consortium), telephone interviews (University of Southern California Consortium, Fred Hutchinson Cancer Research Centre and University of Melbourne) or mailed questionnaires (University of Hawaii, Cancer Care Ontario and Mayo Clinic).
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Information about recreational physical activity performed during three age periods (19 34 years, 35 50 years and ⩾51 years) was collected using a questionnaire based on others that have been shown to be reliable (Friedenreich et al, 1998; Chasan-Taber et al, 2002).
Quality of life data from 96 patients between eight and seventeen years was collected using the EQ-5D-Y as a generic outcome instrument and the Cystic Fibrosis Questionnaire (CFQ) as a disease-specific instrument.
Information on usual PA levels at different ages (current, age 50 years and age 30 years) was collected using five questions relating to occupation, housework, walking or cycling, leisure-time exercise and inactive leisure time (e.g., watching TV or reading).
For this purpose, 65 referenced data for each year were collected using GPS.
Information on habitual food consumption of 178 food items, covering the previous year, was collected using a validated, self-administered, semi-quantitative food frequency questionnaire (FFQ) developed for the Dutch cohorts of the European Prospective Investigation Into Cancer EPICC) Study [21].
ER use in the prior year was collected using two methods: self-report by the Veteran and abstraction of the VA medical records using the Austin Automated Database.
Information about usual physical activity levels during the previous year was collected using five questions relating to occupation, housework, walking or cycling, leisure-time exercise and inactive leisure time.
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