Table 5.

Univariate and multivariable generalized estimating equation model of partial skin necrosis of the flap.

		Univariate analysis			Multivariable model
		OR	(95% CI)	p-Value	OR	(95% CI)	p-Value
Age > 60 yr	8/204 (3.9)	0.45	(0.21–0.97)	0.041a	0.46	(0.21–1.00)	0.049a
Sex	50/708 (7.1)	0.84	(0.29–2.42)	0.741
Vein grafting	4/26 (15.4)	2.47	(0.82–7.45)	0.108
Prior radiation therapy	31/320 (9.7)	1.93	(1.10–3.37)	0.022a	1.35	(0.68–2.66)	0.393
Prior chemotherapy	28/309 (9.1)	1.61	(0.93–2.81)	0.091
Prior free flap reconstruction	39/416 (9.4)	2.24	(1.21–4.14)	0.010a	1.85	(0.88–3.89)	0.107
HTN	12/222 (5.4)	0.67	(0.35–1.30)	0.234
DM	7/121 (5.8)	0.77	(0.34–1.74)	0.528
Liver cirrhosis	0/12 (0)
Renal failure	1/3 (33.3)	6.60	(0.59–74.02)	0.126
Contralateral recipient vessels	8/106 (7.5)	1.07	(0.49–2.34)	0.862

DM, diabetes mellitus; HTN, hypertension.

Logistic regression.

^ap < 0.05.