Table 3.
Multivariate logistic regression analysis identifying variables related to LOS > 3
| Variable | Odds ratio | 95% confidence interval | P value |
|---|---|---|---|
| Female* | 2.623 | 1.330–5.173 | 0.005 |
| Living alone* | 4.127 | 1.573–10.828 | 0.004 |
| Diagnosis | 0.027 | ||
| ONFH (reference) | 1 | ‐ | ‐ |
| DDH | 0.861 | 0.423–1.745 | 0.681 |
| Primary osteoarthritis* | 3.565 | 1.986–6.672 | 0.033 |
| Suppurative arthritis | 2.453 | 0.738–8.152 | 0.143 |
| Rheumatoid arthritis | 1.161 | 0.195–6.927 | 0.870 |
| Fracture of femoral neck | 2.224 | 0.416–11.881 | 0.350 |
| Legg‐Calve‐Perthes disease | 2.225 | 0.416–11.881 | 0.282 |
| Ankylosing spondylitis | 1.431 | 0.184–11.110 | 0.732 |
| Preoperative HB | 1.000 | 0.973–1.027 | 0.974 |
| Postoperative HB | 0.982 | 0.957–1.008 | 0.168 |
| Drain use | 2.106 | 0.655–6.772 | 0.212 |
| Blood transfusion | 4.620 | 0.164–130.068 | 0.369 |
| Diabetes | 2.196 | 0.640–7.540 | 0.211 |
| Respiratory disease | 3.215 | 0.766–13.487 | 0.110 |
| Osteoporosis | 1.435 | 0.517–3.988 | 0.488 |
| Number of comorbidities | 0.412 | ||
| 0 | 1 | ‐ | ‐ |
| 1 | 0.628 | 0.307–1.284 | 0.202 |
| 2 | 1.187 | 0.472–2.980 | 0.716 |
| ≥3 | 0.622 | 0.119–3.236 | 0.572 |
| CCI score | 0.148 | ||
| 0 | 1 | ‐ | ‐ |
| 1 | 0.381 | 0.176–0.828 | 0.015 |
| 2 | 0.501 | 0.230–1.100 | 0.085 |
| 3 | 0.593 | 0.225–1.289 | 0.165 |
| 4 | 0.935 | 0.269–3.246 | 0.915 |
| ≥5 | 0.255 | 0.040–0.605 | 0.145 |
CCI, Charlson comorbidity index; DDH, developmental dysplasia of hip; HB, hemoglobin; ONFH, osteonecrosis of femoral head.
*
Showed statistical significance in multivariate model.