. 2015 Feb 4;15(1):15. doi: 10.1186/s12866-015-0348-1

Table 1.

Risk factors for infection with Enterobacteriaceae resistant to third-generation cephalosporins in 151 patients

	Presence (n = 65)	Absence (n = 86)	Univariate analysis
	Presence (n = 65)	Absence (n = 86)	Crude OR	p
Age (years)
Mean	38.6	31.7
CI	34.6–42.7	28.9–34.5	1.03	0.04
Gender, %
Female	45.9	54.1	0.79	0.48
Preoperative antibiotic prophylaxis^a, %
Yes	46.3	53.7	1.27	0.48
Postoperative antibiotic prophylaxis^b, %
Yes	43.6	56.4	1.27	0.48
Surgery in past 12 months, %
Yes	45.0	55.0	1.14	0.69
Hospitalization in past 12 months, %
Yes	35.3	64.71	0.69	0.49
Altemeier wound class, %
1	42.7	57.3		0.93
2	44.4	55.6
3–4	42.8	57.2
American society of anesthesiologists physical status score, %
1	42.6	57.4		0.45
2	37.0	62.0
3	66.7	33.3
Length of operation, %
<30min	39.0	60.0		0.25
30 min–1 h	41.3	58.7
1–2 h	46.5	53.5
>2 h	75.0	25.0
Type of surgery, %
Urology	50.0	50.0		0.31
Orthopaedics	51.8	48.2
General surgery	34.6	65.4
Gynaecology	40.0	60.0
Delay between surgery and surgical-site infection (days), %
<15	43.8	56.2		0.83
≥15	43.0	57.0

OR, odds ratio.

^aAntibiotics administered ≤ 60 min before the start of surgery.

^bAntibiotics administered immediately after surgery.