Figure 2.

Percentage of subjects with no radiographic change, unilateral and bilateral changes at each time point. Error bars represent 95% confidence intervals. The term ‘No OA’ refers to subjects with no evidence of disease in either knee. a) using a definition of KL ≥ 1 for osteoarthritis. b) using a definition of KL ≥ 2 for osteoarthritis.

Metcalfe et al. BMC Musculoskeletal Disorders 2012 13:153   doi:10.1186/1471-2474-13-153
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