Table 5.

Predictors for postoperative wound complication

	Adjusted model
	OR	95% CI	P value	P for trend *
DM	1.94	1.04-3.63	0.038
BMI	1.13	1.03-1.25	0.011
Number of transfused RBCs	1.04	1.02-1.06	< 0.001
Oldest age quartile 1 of transfused RBCs* (reference)			0.067	0.009
quartile 2	8.92	1.15-69.05	0.036
quartile 3	12.01	1.56-92.63	0.017
quartile 4	13.79	1.82-104.76	0.011

^*P for trend refers to linear trend across lowest to highest quartile.

^*Oldest age quartile 1: oldest age of transfused RBCs unit <10 days (n =218), quartile 2: oldest age of transfused RBCs unit <14 days (n =304), quartile 3: oldest age of transfused RBCs unit <18 days (n =254), quartile 4: oldest age of transfused RBCs unit ≥18 days (n =296).

RBC, red blood cell; DM, diabetes mellitus; BMI, body mass index.