Knee pain was measured with a numeric rating scale for knee pain during the last week. In all analyses we adjusted for age, gender, marital status, education level, radiographic OA and comorbidity. B (95% CI), regression coefficient ( 95% confidence interval). β, Standardized regression coefficient. Semi-partial r2, Squared semi-partial correlation coefficient. BMI, Body-mass index. HADS, Hospital Anxiety and Depression Scale.