Baseline characteristics of RS-I, RS-II and the Chingford Study
| RS-I | RS-II | Chingford Study | |
|---|---|---|---|
| N incident KOA cases | 474 | 69 | 188 |
| KL score 0 at baseline | 111 | 6 | 104 |
| KL score 1 at baseline | 363 | 63 | 84 |
| N controls | 2154 | 856 | 535 |
| % women | 54% | 54% | 100% |
| Mean age (years) (SD) | 65.1 (6.4) | 63.2 (6.6) | 53.7 (5.9) |
| Mean BMI (kg/m2) (SD) | 26.1 (3.4) | 26.9 (3.8) | 25.2 (3.9) |
| Mean follow-up time (years) (SD) | 9.4 (2.2) | 4.1 (0.6) | 10.3 (0.7) |
BMI, body mass index; KL, Kellgren & Lawrence; KOA, knee osteoarthritis; N, number of study subjects; RS-I, Rotterdam Study I; RS-II, Rotterdam Study II.