Table 2.

NHSN surgical wound infection risk classification

Classification	Score
Wound class
Clean or clean-contaminated	0
Contaminated, dirty	1
American Society of Anesthesiologists score
< 3	0
≥ 3	1
Surgical cut time (hours)
≤ 2	0
> 2	1
Total score	0: Low risk
	1: Medium risk
	2, 3: High risk

NHSN = National Healthcare Safety Network.