Associations between progression of knee osteoarthritis and body mass index (n = 532)
| BMI (kg/m2) | ⩾1 mm | ⩾1.5 mm | Increase in K&L | |||
|---|---|---|---|---|---|---|
| Progression (%) | OR (95% CI) | Progression (%) | OR (95% CI) | Progression (%) | OR (95% CI) | |
| BMI, body mass index; K&L, Kellgren and Lawrence. | ||||||
| ORs were adjusted for age, sex and follow-up time. | ||||||
| Progression is defined by two definitions—namely a joint space narrowing of ⩾1, and 1.5 mm at follow-up, and by an increase of minimally 1 grade in K&L index. | ||||||
| ⩽25 | 18.2 | 1 | 3.6 | 1 | 7.8 | 1 |
| >25–27.5 | 20.8 | 1.2 (0.6 to 2.4) | 7.5 | 2.3 (0.7 to 7.7) | 7.8 | 1 (0.5 to 2.0) |
| >27.5 | 24.5 | 1.4 (0.8to 2.6) | 11.2 | 3.2 (1.1 to 9.7) | 15.6 | 2.1 (1.2 to 3.7) |