Table 3.

Analysis of the Potential Risk Factors for Multiantibiotic-Resistant Infections (N = 2,973)

Risk factors	Infections (n = 113)		Odds ratio	p
	Yes	No
Age			0.45	<0.001
≤1 year	60	965
>1 year	53	1,895
Departments
Orthopedics	37	1,210		0.075
Heart surgery	43	1,046	1.276	0.284
General surgery	33	604	1.738	0.023
Surgery type			0.222	<0.001
Emergency	48	403
Scheduled	65	2457
Preoperative length of stay			1.199	0.396
≤3 days	81	2,151
>3 days	32	709
Admission season
Spring	25	1,009		0.024
Summer	26	562	1.867	0.028
Autumn	19	483	1.588	0.135
Winter	43	806	2.153	0.003
Incision type
Clean	44	1,509		<0.001
Clean contaminative	30	1,162	0.885	0.612
Contaminative	19	141	4.621	<0.001
Dirty	20	48	14.29	<0.001
Duration of operation			1.949	0.01
<3 hr	94	2,595
≥3 hr	19	265
Preoperative infection			0.146	<0.001
Yes	76	661
No	37	2,199
Intraoperative blood loss			1.104	0.849
<50 mL	109	2,768
≥50 mL	4	92
Nature of surgery			0.155	0.009
Minimal	111	2,563
Conventional	2	297
Postoperative invasive equipment			0.528	0.001
Yes	68	1,269
No	45	1,591
Duration of catheter drainage
No	22	1,735		<0.001
<3 days	28	760	2.906	<0.001
≥3 days	63	365	13.612	<0.001
Timepoint for prophylactic antibiotics
No	8	1,337		<0.001
0.5–1 hr postoperatively	57	1,121	8.498	<0.001
Other	48	402	19.955	<0.001