Chronic kidney disease severely deteriorates the outcome of gastrointestinal bleeding: A meta-analysis

Table 2 Basic characteristics of the studies included in the meta-analysis

Ref.	Country	Study type	Years of study	Group	Sample size	Age	Mortality	Transfusion	Rebleeding	Length of hospitalization
Boyle et al[17], 1983	United States	Retrospective	1977-1981	Control	40	54 ± 21	√	√	-	√
				CKD (mix)	20	59 ± 41
Cheung et al[10], 2010	Canada	Retrospective	2000-2006	Control	50	67 ± 13	√	√	√	√
				CKD	50	71 ± 13
				ESRD	50	68 ± 12
Hung et al[25], 2014	Taiwan	Retrospective	2007	Control	6322	54.6 ± 13.3	√	-	-	-
				ESRD	110	NR
Sood et al[9], 2012	United States	Retrospective	2007	Control	347245	NR	√	-	-	-
				CKD	35985	NR
				ESRD	14983	NR
Tsai et al[16], 1996	Taiwan	Prospective	1991-1994	Control	640	55.7 ± 16.22	√	√	√	-
				ESRD	58	64.1 ± 11.42
Zuckerman et al[26], 1985	United States	Retrospective	1980-1983	Control	423	63 (16-96)3	-	-	√	-
				CKD (mix)	59	57 (24-84)3

¹Data expressed as mean ± SEM (standard error of mean);

²Data expressed as mean ± SD (standard deviation);

³Data expressed as median (interquartile range). NR: Not reported; CKD: Chronic kidney disease; ESRD: End-stage renal disease.