. 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 II.

Crude and weighted association between postoperative surgical site infection (SSI) and primary assist or secondary patency

	Loss of primary patency, %
	SSI	No SSI	HR (95% CI)	P value
Crude

6-month	6.2	3.6	1.43 (1.08-1.90)	.01

12-month	24.8	20.4	1.22 (1.05-1.41)	.01

IPTW^a

6-month	5,6	3.4	1.34 (0.98-1.86)	.07

12-month	23.1	20.1	1.14 (0.96-1.35)	.13

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.