Additional file 2 of Incidence and risk factors of symptomatic knee osteoarthritis among the Chinese population: analysis from a nationwide longitudinal study

Yan Ren, Jiang Hu, Jing Tan, , , , , Qiao He, Kang Zou, Xin Sun & Bo Tan
Additional file 2 Table S2. Missing data in baseline variables in the symptomatic knee OA and non-symptomatic knee OA groups
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