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Table 1 Characteristics of the study sample

From: Assessing the external validity of algorithms to estimate EQ-5D-3L from the WOMAC

  Subjects with frequent knee pain and no knee OA (n = 489) Subject with knee OA (with or without frequent knee pain) (n = 579)
Women, % 70.8 62.5
Age, years (SD) 68.2 (7.2) 70.4 (7.0)
Body mass index (SD) 27.4 (4.4) 28.9 (5.4)
Smoking, %
 Never 42.2 42.4
 Current 14.6 12.3
 Ex-smoker 43.2 45.3
Comorbidity, %
 None 12.9 14.4
 Single 30.9 25.0
 Multiple 56.2 60.6
WOMAC scores, mean (SD)
 Pain 4.7 (3.6) 7.0 (4.1)
 Stiffness 2.0 (1.7) 3.2 (1.9)
 Physical function 17.3 (13.5) 25.8 (14.5)