Table 3. Univariate and multivariable regression analysis for significant postoperative pain.

Covariate	Univariate CRR (95% CI)	Multivariate ARR (95% CI)
Intervention
Single	1	1
Double	0.14 (0.08-0.25)	0.14 (0.07-0.25)
Age up to 50	1	1
C51	0.96 (0.63-1.46)	0.99 (0.65-1.51)
Weight of specimen
Up to 850 g	1	1
C851 g	1.22 (0.82-1.84)	1.28 (0.84-1.89)
Neoadjuvant therapy
No	1	1
Yes	0.83 (0.56-1.24)	0.74 (0.50-1.11)
BMI
Normal	1	1
Overweight	1.40 (0.92-2.13)	1.41 (0.91-2.12)
Obese	1.02 (0.41-2.51)	0.88 (0.35-2.18)
CRR: Crude relative risk, CI: Confidence interval, ARR: Adjusted relative risk.