Table 4.

Modified Poisson regression model for independent variables comparing ERAS group to pre-ERAS group

	Model 1. (variable: ERAS)	Model 2. (variables: ERAS, age, sex)	Model 3. (variables: ERAS, age, sex, stage, ACE-27 score)
Independent variable	RR (95% CI)	RR (95% CI)	RR (95% CI)
Overall complications	0.96 (0.83–1.15)	0.97 (0.82–1.15)	0.98 (0.83–1.17)
Surgical complications	0.99 (0.78–1.27)	1.00 (0.78–1.28)	1.01 (0.78–1.33)
Medical complications	0.64 (0.46–0.89)*	0.62 (0.45–0.86)*	0.66 (0.47–0.93)*
Type of surgical complication
Total flap loss	3.19 (1.25–8.15)	3.23 (1.28–8.13)	3.90 (1.42–10.71)
Surgical site hematoma	0.32 (0.09–1.07)*	0.32 (0.10–1.09)*	0.27 (0.06–1.27)*
Surgical site infection	0.61 (0.22–1.70)*	0.64 (0.24–1.72)*	0.54 (0.14–2.07)*
Type of medical complication
Pneumonia	0.64 (0.25–1.62)*	0.61 (0.24–1.57)*	0.66 (0.23–1.84)*
Delirium	0.60 (0.33–1.10)*	0.58 (0.32–1.05)*	0.62 (0.33–1.14)*
Re-operation within 30 days	0.81 (0.58–1.14)	0.81 (0.58–1.14)	0.90 (0.63–1.28)
Re-admission to ICU/prolonged stay in ICU	1.99 (1.35–2.95)	1.94 (1.32–2.86)	2.02 (1.30–3.15)
Died within 30 days	2.47 (0.60–10.14)	2.27 (0.56–9.23)	1.77 (0.31–10.13)
Died within 6 months	0.99 (0.53–1.86)	0.99 (0.52–1.89)	0.74 (0.30–1.82)

RR, relative risk; CI, confidence interval; ACE-27 score, Adult Comorbidity Evaluation 27; ICU, intensive care unit

*Statistically significant