Open Access Research article

Body mass index, occupational activity, and leisure-time physical activity: an exploration of risk factors and modifiers for knee osteoarthritis in the 1946 British birth cohort

Kathryn R Martin12*, Diana Kuh2, Tamara B Harris1, Jack M Guralnik3, David Coggon4 and Andrew K Wills5

Author Affiliations

1 Laboratory of Epidemiology and Population Sciences, National Institute on Aging, National Institutes of Health, 7201 Wisconsin Avenue, Room 3C309, Bethesda, Maryland 20814, USA

2 MRC Unit for Lifelong Health and Ageing, University College London, London, UK

3 Department of Epidemiology and Public Health, Division of Gerontology, University of Maryland, Maryland, USA

4 MRC Lifecourse Epidemiology Unit, University of Southampton, Southampton, UK

5 MRC CAiTE, School of Social & Community Medicine, University of Bristol, Bristol, UK

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BMC Musculoskeletal Disorders 2013, 14:219  doi:10.1186/1471-2474-14-219

Published: 24 July 2013

Additional files

Additional file 1:

A. Clinical knee examination protocol. B. ACR Criteria for clinical classification of idiopathic osteoarthritis (OA) of the knee [29]. C. Table S1. Top 20 Occupations for men and women by year, ranked from high to low. d. Table S2. Distribution of BMI by activity exposure (occupational/leisure) at age 36y, 43y and 53y, by gender.

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