Characteristics of participants at baseline and follow-up
| Characteristic at baseline | No. at baseline (n = 1798) (%) | No. (%) at follow-up (n = 1256) (%) |
|---|---|---|
| Sex: | ||
| Male | 816 (45) | 562 (45) |
| Female | 979 (54) | 694 (55) |
| Unknown | 3 (0.2) | |
| Age group (years): | ||
| <35 | 236 (13) | 131 (10) |
| 35–39 | 189 (11) | 114 (9) |
| 40–44 | 241 (13) | 165 (13) |
| 45–49 | 268 (15) | 188 (15) |
| 50–54 | 266 (15) | 200 (16) |
| 55–59 | 354 (20) | 274 (22) |
| ⩾60 | 244 (14) | 184 (15) |
| Knee pain during past 12 months: | ||
| Any | 643 (36) | 468 (37) |
| >6 months | 149 (8) | 107 (9) |
| Disabling | 88 (5) | 61 (5) |
| Self-rated health: | ||
| Fair/poor | 247 (14) | 148 (12) |
| Somatisation score: | ||
| Worst band | 685 (38) | 461 (37) |
| SF-36 MH score: | ||
| Worst band | 617 (34) | 406 (32) |
| Combined mental health score: | ||
| Worst band | 345 (19) | 216 (17) |