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) |