Table 3.
Multivariate analysis for predictors of length of stay following total hip and total knee arthroplasty in patients with rheumatoid arthritis.
| Multivariate variable | Level | Estimated model coefficient (standard error) |
Percentage change in the original scale of length
of stay with 1 unit increase of a continuous predictor, or a
comparison of one category to the reference category for a
categorical predictor*
(95% CI) |
P value |
|---|---|---|---|---|
| Sex | Female vs. Male | 0.18 (0.08) |
19.72% (2.35%, 40.05%) | .04 |
| TXA | No vs. Yes | 0.04 (0.07) |
4.08% (−9.26%, 19.38%) | .61 |
| Type of Surgery | Hip vs. Knee | −0.22 (0.06) |
−19.75% (−28.65%, −9.73%) | .0002 |
| Opioid | No vs. Yes | −0.20 (0.06) | −18.13% (−27.21%, −7.91%) | .0007 |
| Postoperative Transfusion | No vs. Yes | −0.25 (0.09) | −22.11% (−34.71%, −7.10%) | .006 |
| Hemoglobin at baseline | 0.03 (0.02) | −2.96% (−6.69%, 0.92%) | .18 | |
| DAS28_esr at baseline | 0.07 (0.04) | 7.25% (−0.84%, 16.00%) | .053 | |
| CDAI at baseline | −0.003 (0.004) | −0.30% (−1.08%, 0.49%) | .51 |
TXA Tranexamic acid, CI confidence interval, CDAI Clinical Disease Activity Index.
*
Percentage change in the original scale of length of stay with 1 unit increase of a continuous predictor, or a comparison of one category to the reference category for a categorical predictor: (exponential [estimated model coefficient]-1)*100. Multivariate analysis included all characteristics found significant in the univariate analysis.