Bivariate analysis of risk ratio for demographic and perioperative characteristics.
Characteristic | Among Extended Length of Stays, % | Relative Risk | CI | P Valuea |
Age | ||||
<50 y | 42.3% | Reference | ||
≥50 y | 57.7% | 1.1 | (0.8–1.7) | 0.559 |
Gender | ||||
Women | 48.1% | Reference | ||
Men | 51.9% | 1.0 | (0.7–1.5) | 0.845 |
Body mass index | ||||
<30 kg/m2 | 53.9% | Reference | ||
≥30 kg/m2 | 46.2% | 0.9 | (0.6–1.4) | 0.697 |
Smoking status | ||||
Nonsmoker | 84.6% | Reference | ||
Smoker | 15.4% | 0.8 | (0.5–1.4) | 0.476 |
American Society of Anesthesiologists score | ||||
<2 | 71.2% | Reference | ||
≥2 | 28.9% | 1.7 | (1.2–2.4) | 0.003 |
Charlson Comorbidity Index score | ||||
<1 | 20.5% | Reference | ||
≥1 | 79.6% | 1.0 | (0.6–1.7) | 0.851 |
Hypertension | ||||
Nonhypertensive | 63.5% | Reference | ||
Hypertensive | 36.5% | 1.4 | (1.0–2.1) | 0.066 |
Diabetes | ||||
Nondiabetic | 80.8% | Reference | ||
Diabetic | 19.2% | 1.5 | (1.0–2.3) | 0.037 |
Preoperative VAS backb | ||||
<7 | - | - | - | - |
≥7 | - | - | - | - |
Preoperative VAS leg | ||||
<7 | 17.3% | Reference | ||
≥7 | 82.7% | 2.1 | (1.2–3.8) | 0.012 |
Operative time | ||||
≤127 min | 44.2% | Reference | ||
>127 min | 55.8% | 1.1 | (0.8–1.7) | 0.560 |
Estimated blood loss | ||||
≤63 mL | 57.7% | Reference | ||
>63 mL | 42.3% | 1.2 | (0.8–1.7) | 0.415 |