Characteristics of the study population (n=3071)
| Characteristics participants | |
|---|---|
| Age in years (mean, SD) | 56.8 (6.7) |
| Body mass index (mean, SD) | 27.7 (4.6) |
| Female gender (n, %) | 1741 (56.7) |
| Complaints of the knee(s) lasting more than 1 month (n, %) | 901 (29.6)* |
| Knees scored with original description | 5378 knees |
| Grade 0 (n, %) | 4374 (81.3) |
| Grade 1 | 701 (13.0) |
| Grade 2 | 241 (4.5) |
| Grade 3 | 53 (1.0) |
| Grade 4 | 9 (0.2) |
↵* 3048 participants supplied information about knee complaints.