Table 5.
Odds ratios of total hip replacement for characteristics at baseline for 111 hip osteoarthritis patients with full follow-up
| Baseline covariate | n | Unadjusted odds ratio (95%CI) | P-value | Adjusted odds ratio (95%CI)a | P-value |
|---|---|---|---|---|---|
| Separated, divorced, widowed | 111 | 1.78 (0.73 to 4.35) | 0.209 | ||
| One or more comorbidities | 111 | 0.65 (0.30 to 1.41) | 0.273 | 0.29(0.11 to 0.79) | 0.016 |
| Uses walking stick | 111 | 1.89 (0.88to 4.09) | 0.105 | 2.56 (0.99 to 6.61) | 0.053 |
| Pain always present | 111 | 2.00 (1.02 to 4.80) | 0.045 | ||
| VAS pain score (0 = no pain to 10 = worse pain) | 110 | 1.46 (1.18to 1.80) | <0.001 | ||
| WOMAC pain score (0 = no pain to 20 = extreme pain) | 111 | 1.13 (1.02 to 1.26) | 0.027 | ||
| WOMAC physical function score (0 = no difficulty to 68 = extreme difficulty) | 111 | 1.06 (1.03 to 1.10) | 0.001 | ||
| WOMAC stiffness score (0 = no stiffness to 8 = extreme stiffness) | 111 | 1.69 (1.26 to 2.27) | <0.001 | 1.82(1.27 to 2.61) | 0.001 |
| Oxford Hip Score (12 = least difficulties to 60 = most difficulties) | 110 | 1.10 (1.05 to 1.16) | 0.001 | ||
| SF-36 painb | 111 | 0.97 (0.95 to 0.99) | 0.002 | ||
| SF-36 physical function | 111 | 0.97 (0.95 to 0.99) | 0.002 | ||
| SF-36 role limitation (physical) | 111 | 0.94 (0.90 to 0.98) | 0.003 | 0.95(0.91 to 1.00) | 0.062 |
| SF-36 role limitation (mental) | 110 | 0.97 (0.94 to 1.00) | 0.026 | ||
a
Forward stepwise final model: likelihood ratio χ2 = 28.74, df = 4, P<0.001; receiver operating characteristic area under the curve = 0.76, P<0.001; Nagelkerke pseudo-R2 = 0.32; 58/66 having total joint replacement (TJR) correctly predicted (sensitivity = 87.9%), 27/42 not having TJR correctly predicted (specificity = 64.3%), 85/108 surgical outcomes correctly predicted (correct prediction rate = 78.7%).
b
All SF-36 scores: lower scores indicate worse outcomes. SF-36 = Short Form-36. VAS = visual analogue scale. WOMAC =Western Ontario and McMaster Universities Osteoarthritis Index.