Table 2.
Linear regression analysis of factors associated with the increased postoperative opioid requirement.
| Parameters | Univariate | Multivariate | ||||
|---|---|---|---|---|---|---|
| β | 95% CI | P value | β | 95% CI | P value | |
| Age (years) | −0.62 | −0.90 to −0.34 | <0.001 | −0.46 | −0.74 to −0.17 | 0.001 |
| Groups classified by the duration of smoking cessation | ||||||
| G0 (nonsmoker; reference) | 0 | 0 | ||||
| G1 (≤1 month) | 16.22 | 9.31–23.13 | <0.001 | 12.80 | 5.81–19.80 | <0.001 |
| G2 (>1 month) | −6.23 | −12.92–0.46 | 0.068 | |||
| BMI (kg/m2) | 0.54 | −0.87–1.95 | 0.449 | |||
| Anesthesia duration (min) | −0.14 | −0.31–0.03 | 0.106 | |||
| Intraoperative remifentanil consumption (mg) | 3.62 | −0.69–7.92 | 0.099 | |||
β indicates regression coefficient; CI: confidence interval; BMI: body mass index; G0: nonsmokers, G1: smokers with ≤1 month smoking cessation preoperatively; G2: smokers with >1 month smoking cessation preoperatively.