Table 2. Preoperative and Operative Characteristics as Risk Factors for Readmission After Total Knee Arthroplasty.
| Variable | Odds Ratio (95% CI) ¥ ǂ | P value ǂ |
|---|---|---|
| Preoperative Characteristics | ||
| Age (per year) | 1.021 (1.018 to 1.025) | <0.0001 |
| Sex female vs male | 0.78 (0.73 to 0.83) | <0.0001 |
| Race | ||
| Black vs White | 1.24 (1.11 to 1.37) | <0.0001 |
| Asian vs White | 0.62 (0.48 to 0.80) | 0.0002 |
| Native Hawaiian vs White | 0.58 (0.30 to 1.13) | 0.1118 |
| American Indian vs White | 0.60 (0.36 to 1.00) | 0.0514 |
| Non reported vs White | 0.87 (0.78 to 0.96) | 0.0048 |
| BMI Category | ||
| Underweight vs Overweight | 1.06 (0.56 to 1.99) | 0.8670 |
| Normal vs Overweight | 1.11 (0.99 to 1.23) | 0.0750 |
| Obese vs Overweight | 0.96 (0.88 to 1.04) | 0.2742 |
| Very obese vs Overweight | 0.92 (0.84 to 1.01) | 0.0715 |
| Morbidly Obese vs Overweight | 1.20 (1.08 to 1.32) | 0.0003 |
| Comorbidities | 1.29 (1.25 to 1.34) | <0.0001 |
| Operative variables | ||
| ASA class | ||
| 1- No disturb vs 2 -Mild Disturb | 1.19 (0.93 to 1.53) | 0.1705 |
| 3- Severe Disturb vs 2 -Mild Disturb | 1.43 (1.34 to 1.53) | <0.0001 |
| 4- Life Threat vs 2 -Mild Disturb | 2.06 (1.73 to 2.44) | <0.0001 |
| Non Assigned vs 2 -Mild Disturb | 1.75 (0.71 to 4.32) | 0.2225 |
| Operation time (per min) | 1.002 (1.002 to 1.003) | <0.0001 |
¥
The values are given as the odds ratio, with the 95% CI in parentheses.
ǂ
Logistic regression modeling adjusted for age, sex, race, BMI category, and presence of one of more preoperative comorbidities, ASA class, and operative time.