Multivariable model of the knee pain subgroup for the association with total knee arthroplasty (TKA)a
| β | OR (95% CI) | P-value | |
|---|---|---|---|
| BMI, kg/m2 | 0.10 | 1.1 (1.0 to 1.2) | <0.01 |
| Painful active knee flexion | 1.35 | 3.8 (1.6 to 9.5) | <0.01 |
| K/L score 1 (versus K/L score 0) | 1.86 | 6.4 (1.7 to 23.4) | <0.01 |
↵a Model obtained with generalised estimating equations (GEE). The obtained OR are unadjusted for age and sex; however, all three variables do remain significant after adjustment (data not presented). An OR >1 indicates an increased risk for undergoing TKA. β = regression coefficient (beta). BMI = body mass index. K/L = Kellgren and Lawrence. OR = odds ratio.