. Author manuscript; available in PMC: 2023 Oct 1.

Published in final edited form as: J Vasc Surg. 2022 Jun 11;76(4):1014–1020. doi: 10.1016/j.jvs.2022.04.040

Table III.

Crude and weighted association between postoperative surgical site infection (SSI) and major amputation

	Amputation, %
	SSI	No SSI	HR (95% CI)	P value
Crude

6-month	2.2	0.9	2.20 (1.43-3.38)	.0004

12-month	8.1	5.4	1.55 (1.22-1.96)	.0003

IPTW^a

6-month	1.6	0.8	1.84 (1.07-3.17)	.03

12-month	7.1	5.0	1.44 (1.10-1.90)	.008

CI, Confidence interval; HR, hazard ratio; IPTW, inverse probability of treatment weights.

IPTW were calculated using logistic regression; models included patient age, sex, race, comorbidities, indication, preoperative creatinine, hemoglobin, statin use and aspirin use, admission type, graft artery recipient, material used for graft, and type of skin preparation used.