Controls | Knee OA cases | Hip OA cases | |
---|---|---|---|
Number | 967 | 1042 | 1006 |
Age, years (SD) | 63.5 (8.5) | 68.1 (7.4)* | 67.6 (7.1)* |
BMD, z-score (SD) | 0.6 (1.2) | 1.0 (1.3)* | 1.0 (1.3)* |
Women, % | 47.2 | 48.6 | 50.5 |
BMI (kg/m2), % prevalence | |||
<25 | 32.7 | 9.5 | 19.2% |
25 to 30 | 43.2 | 36.0* | 41.7* |
>30 | 24.1 | 54.5* | 39.2* |
Nodal OA, % prevalence | 10.3 | 28.8* | 24.6* |
Injury (knee or hip), % prevalence | 16.8 | 32.8* | 22.2* |
Occupational risk factors, % prevalence | |||
None | 61.8* | 48.8 | 57.2 |
1 OA risk factor | 12.5 | 14.3 | 12.1 |
2 OA risk factors | 11.7 | 14.1 | 12.4 |
3+ OA risk factors | 14.1 | 22.7* | 18.3* |