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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Martin et al. BMC Musculoskeletal Disorders 2013 14:219   doi:10.1186/1471-2474-14-219