Table IV.

Univariate cox regression survival analysis and log-rank test survival analysis of all 123 cases included in the study

Clinical factors	Overall survival rate (%) Mean ± SD, HR (95% CI)	P-value
Age	HR = 1.025, 95% CI: 1.004–1.046	0.018 *0.028
Gender:
Male	26.8 ±2.9
Female	25.2 ±3.4
	HR = 1.032, 95% CI: 0.838–1.27	0.768 *0.761
DGE:
Yes	27.07 ±2.7
No	24.25 ±3.6
	HR = 0.884, 95% CI: 0.574–1.359	0.574, *0.560
Perineural infiltrations:
Yes	22.4 ±2.2
No	40.81 ±5.7
	HR = 2.213, 95% CI: 1.26–3.87	0.005 *0.003
Postop. fistula:
Yes	22.9 ±3.2
No	28.3 ±2.9
	HR = 1.309, 95% CI: 0.872–1.967	0.194 *0.178
Postop. fistula grade:
Grade A	24.6 ±2.9 HR = 0.146, 95% CI: 0.049–0.434	0.001
Grade B	25.8 ±3.4 HR = 0.183, 95% CI: 0.06–0.557	0.003
Grade C	1.2 ±0.25 HR = 0.137, 95% CI: 0.034–0.549	0.005 *< 0.001
Postop. haemorrhage:
Yes	10.6 ±4.0
No	29.05 ±2.4
	HR = 2.57, 95% CI: 1.500–4.403	0.001 *< 0.001

P* – log-rank test of survival (Kaplan-Meier), CI – confidence interval, HR – hazard ratio, SD – standard deviation.