Table 6.
Results of multivariable logistic regression for total knee arthroplasty
| Outcome; comparison | OR (95% CI) | p value |
|---|---|---|
| In-hospital fracture or dislocation* | ||
| Overweight v. normal weight | 1.11 (0.23 to 5.37) | 0.90 |
| Obese I v. normal weight | 1.48 (0.32 to 6.81) | 0.62 |
| Obese II v. normal weight | 0.68 (0.11 to 4.14) | 0.68 |
| Obese III v. normal weight | 1.62 (0.31 to 8.38) | 0.56 |
| Postoperative medical events* | ||
| Overweight v. normal weight | 1.49 (0.91 to 2.44) | 0.11 |
| Obese I v. normal weight | 2.25 (1.39 to 3.64) | 0.001 |
| Obese II v. normal weight | 2.28 (1.38 to 3.75) | 0.001 |
| Obese III v. normal weight | 2.05 (1.21 to 3.46) | 0.007 |
| Required blood transfusion* | ||
| Overweight v. normal weight | 0.77 (0.64 to 0.92) | 0.004 |
| Obese I v. normal weight | 0.58 (0.48 to 0.70) | < 0.001 |
| Obese II v. normal weight | 0.48 (0.39 to 0.60) | < 0.001 |
| Obese III v. normal weight | 0.37 (0.29 to 0.47) | < 0.001 |
| Readmission within 30 days* | ||
| Overweight v. normal weight | 0.84 (0.62 to 1.14) | 0.26 |
| Obese I v. normal weight | 0.82 (0.61 to 1.11) | 0.20 |
| Obese II v. normal weight | 0.78 (0.56 to 1.09) | 0.15 |
| Obese III v. normal weight | 1.07 (0.76 to 1.50) | 0.70 |
| Deep infection* | ||
| Overweight v. normal weight | 0.61 (0.26 to 1.41) | 0.25 |
| Obese I v. normal weight | 0.72 (0.32 to 1.61) | 0.42 |
| Obese II v. normal weight | 1.05 (0.46 to 2.41) | 0.90 |
| Obese III v. normal weight | 2.00 (0.01 to 4.44) | 0.049 |
| Discharge to acute care, subacute care or long-term care facility* | ||
| Overweight v. normal weight | 0.83 (0.67 to 1.02) | 0.08 |
| Obese I v. normal weight | 0.93 (0.75 to 1.15) | 0.51 |
| Obese II v. normal weight | 1.34 (1.07 to 1.68) | 0.012 |
| Obese III v. normal weight | 2.57 (2.03 to 3.24) | < 0.001 |
CI = confidence interval; OR = odds raio.
*
Adjusted for age, sex and pre-surgery risk factors using logistic regression.