Independent risk factors and a predictive model for surgical site infection following colorectal cancer surgery

Table 3 Comparison of general data between the infection and non-infection groups, n (%)/mean ± SD

	Infection group (n = 45)	Non-infection group (n = 183)	χ2/t	P value
Age (years)	66.55 ± 8.51	61.73 ± 9.03	3.271	0.001
Sex			0.061	0.805
Male	19 (42.22)	81 (44.26)
Female	26 (57.78)	102 (55.74)
BMI (kg/m2)	25.90 ± 3.03	22.01 ± 2.97	7.858	< 0.001
Surgical approach
Open surgery	34 (75.56)	90 (49.18)	10.131	0.002
Laparoscopic surgery	11 (24.44)	93 (50.82)
Comorbid diabetes mellitus			27.391	< 0.001
Yes	22 (48.89)	25 (13.66)
No	23 (51.11)	158 (86.34)
Incision length (cm)	12.26 ± 3.31	9.89 ± 2.86	4.828	< 0.001
Duke stage (stage C/D)			0.349	0.555
Stage C	28 (62.22)	105 (57.38)
Stage D	17 (37.78)	78 (42.62)

Measurement data (age, body mass index, incision length) were compared using independent samples t-test; counting data (sex, surgical approach, diabetes mellitus, duke stage) were compared using χ² test. BMI: Body mass index.