Table 2

Rate of surgical site infection by patient ASA class^*

Variable	ASA class; no (%)^†
Variable	1	2	3	4	5	Total
No SSI	8061 (42.06)	3585 (18.7)	4158 (21.69)	1629 (8.5)	210 (1.1)	17 643 (92.05)
SSI	221 (1.67)	258 (1.66)	417 (2.55)	319 (1.77)	52 (0.3)	1267 (7.95)
Total	8282 (43.73)	3843 (20.36)	4575 (24.24)	1948 (10.27)	262 (1.4)	18 910 (100)
Infection rate, %	2.7	6.7	9.1	16.4	19.9

ASA = American Society of Anaesthesiologists; SSI = surgical site infection.
↵* χ²: 98.135, p < 0.001.
↵† Unless indicated otherwise.