Association between preoperative anemia and postoperative short-term outcomes in patients undergoing colorectal cancer surgery - a propensity score matched retrospective cohort study

Table 3 Postoperative outcomes in cohort after propensity matching (n = 1218)

Characteristics		No anemia n = 609	Anemia n = 609	OR	95%CI	P-value ^d
Primary Outcome	Major Morbidity ^a	146 (24.0)	157 (25.8)	1.102	0.849–1.429	0.466
Secondary Outcome	Surgical Site Infection ^b	60 (9.9)	70 (11.5)	1.126	0.785–1.614	0.291
	Anastomotic Bleeding	13 (2.1)	5 (0.8)	0.610	0.251–1.483	0.379
	Anastomotic Leakage	24 (3.9)	37 (6.1)	1.450	0.859–2.427	0.195
	Chylous Ascites	21 (3.4)	22 (3.6)	0.876	0.488–1.570	0.655
	Pneumonia	63 (10.3)	77 (12.6)	1.292	0.909–1.837	0.153
	Postoperative Length of Stay	8.0 [7.0, 11.0]	8.0 [6.0, 12.0]	-	-	0.311
	Bloodstream Infection ^c	4 (0.7)	2 (0.3)	-	-	-
	Myocardial Infarction	1 (0.2)	0 (0.0)	-	-	-
	Congestive Heart Failure	0 (0.0)	2 (0.3)	-	-	-
	Stroke/Transient Ischemic Attack	0 (0.0)	1 (0.2)	-	-	-
	Pulmonary Embolism	4 (0.7)	0 (0.0)	-	-	-
	Postoperative Death	1 (0.2)	2 (0.3)	-	-	-
	Unplanned Secondary Surgery	4 (0.7)	4 (0.7)	-	-	-

Data are presented as n (%) or median [IQR]
^a Major morbidity includes surgical site infection, anastomotic bleeding, anastomotic fistula, chylous ascites, bloodstream infection, myocardial infarction, congestive heart failure, stroke/transient ischemic attack, pulmonary embolism, and pneumonia
^b Surgical Site Infection include superficial/deep incisional, organ or space
^c Bloodstream Infection include sepsis and bacteremia
^d Chi-Square test was used for categorical data and Mann-Whitney U test was used for continuous data; Bonferroni correction is used in secondary outcome, P < 0.08 is considered to have statistically significant in the analysis of secondary outcome

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