Table 2.

Association between predictors and progression of osteoarthritis of the hip of complete study population in two models (n=2918 hips). Values are odds ratios (adjusted for follow-up time) with 95% confidence intervals

Predictor variable	Model 1 (clinical variables)	Model 2 (including radiological variables)
Age in years	1.07 (1.05 to 1.09)	1.06 (1.04 to 1.08)
Sex	1.7 (1.3 to 2.2)	1.8 (1.4 to 2.4)
Disability index score ≥0.5	1.9 (1.4 to 2.6)	—
Presence of hip pain	2.6 (1.9 to 3.7)	2.4 (1.7 to 3.5)
Baseline joint width space (≤2.5 mm)	—*	1.9 (1.2 to 2.9)
Baseline Kellgren and Lawrence grade ≥2	—*	5.8 (4.0 to 8.4)
Correctly predicted by model	0.875	0.897

Predictors were included in a model with P<0.05.

Progression of osteoarthritis of the hip was defined as a joint space narrowing ≥1.0 mm or a total hip replacement at follow-up.

^*Not tested in this model.