Table 2.

SSI stratification by type of surgery

	Pre-SARS-CoV-2 era (2018–1019) n = 164	SARS-CoV-2 era (2020) n = 41	p value	Pre-SARS-CoV-2 era (2018–1019) n = 47	SARS-CoV-2 era (2020) n = 14	p value	Pre-SARS-CoV-2 era (2018–1019) n = 207	SARS-CoV-2 era (2020) n = 68	p value
Colorectal surgery				HBP surgery			Breast–thyroid surgery
Gloves	100%	100%	1	100%	100%	1	100%	100%	1
Surgical mask	0%	100%	0.0001	0%	100%	0.0001	0%	100%	0.0001
Open to visitors	100%	0%	0.0001	100%	0%	0.0001	100%	0%	0.0001
Timing (election)	(87) 53%	(19) 46.3%	0.276	(33) 69.6%	(8) 57.1%	0.29	(178) 86%	(67) 98.5%	0.03
Surgical wall protectors	(47) 28,7%	(17) 41.5%	0.083	(16) 34%	(6) 42.9%	0.382	(4) 1.9%	0%	0.319
Length of surgery (min)	144.68 ± 83.8	162.9 ± 97	0.229	96 [35–300]	253 [50–500]	0.0001	85 [20–720]	95 [28–300]	0.291
Drain	(118) 72%	(31) 75.6%	0.05	(21) 44.7%	(11) 78.6%	0.05	(64) 30.9%	(38) 55.9%	0.202
SSI (total)*	(30) 18.3%	(1) 2.4%	0.005	(3) 6.4%	(2) 16.4%	0.128	(2) 1%	0%	0.566
Superficial SSI*	(20) 11.9%	0%	0.01	(2) 4.3%	0.00%	0.01	(1) 0.5%	0%	0.753
Deep SSI*	(14) 8.2%	0%	0.046	0%	0%	1	(1) 0.5%	0%	0.753
Organ-space SSI	(13) 8.2%	(1) 2.4%	0.176	(2) 4.3%	(2) 14.3%	0.223	0%	0%	1

Values are mean ± SD, %, or median [interquartile range]

*Statistically significant difference between SSIs index before and during COVID-19 era. For the other abbreviations, see Table 1