Table 1. Detailed patient characteristics.

	Total	patients with AL	patients without AL	p
patients n (%)	17 867 (100%)	2 134 (11.9%)	15 733 (88.1%)	<0.0001*
gender n (%)	17 827 (100%)	2 127 (11.9%)	15 700 (88.1%)	<0.0001*
(ratio - male:female)	1.4:1	2.5:1	1.3:1
mean age (years ± SD)	66.95 ± 10.54	66.31 ± 10.24	67.03 ± 10.57	<0.0001**
mean body mass index (kg/m2 ± SD)	26.49 ± 4.22	26.54 ± 4.24	26.49 ± 4.21	0.485**
mean stay in hospital (days ± SD)	21 ± 12.7	37 ± 19.9	19 ± 9.8	<0.0001**
hospital mortality n (%)	379 (2.1%)	160 (7.5%)	219 (1.4%)	<0.0001*

^*Chi-square test

^**Mann-Whitney-U-test

AL - anastomotic leakage