Table 2.

Summary of the information utilized to perform the meta-analysis

Study ID	Author	Country	Year	Average age (yrs)	Preoperative IABP usage (no. pts)	Renal Failure (no. pts)	Mean ECMO support (days)	Diabetes mellitus (no. pts)	Survivors	Patient no.
1	Khorsandi	UK	2015	71	15	2	5.5	0	5	15
2	Doll	Germany	2004	61.3	144	122	NA	68	52	219
3	Khorsandi	UK	2016	51	23	7	5.5	NA	8	23
4	Rastan	Germany	2010	63.5	383	81	4.6	168	127	516
5	Slottosch	Germany	2013	60	72	26	3.3	18	23	77
6	Hsu	Taiwan	2010	63	51	16	7.5	19	26	51
7	Ko	Taiwan	2002	56.8	44	28	NA	NA	20	76
8	Muehrcke	USA	1996	47.3	17	12	2.5	NA	7	22
9	Santarpino	Europe	2015	64.6	16	7	4.5	25	8	20
10	Saeed	Germany	2015	65	9	8	8.5	NA	2	9
11	Sajjad	UK	2012	55.6	19	NA	4	NA	1	19
12	Mikus	Italy	2013	53.1	14	7	5	4	6	14
13	Unosawa	Japan	2013	64.4	39	15	2.6	9	14	47
14	Pokersnik	USA	2012	65	29	16	4	19	15	49
15	Moreno	Spain	2011	56.8	12	4	5.4	5	6	12
16	Wu	Taiwan	2010	60	110	46	6	NA	46	110
17	Elsharkawy	USA	2010	53.5	22	101	NA	50	84	233
18	Bakhtiary	Germany	2008	60.1	30	39	6.4	38	13	45
19	Doll	Germany	2003	59.8	95	64	2.8	NA	28	95
20	Wang	Taiwan	1996	46.5	9	3	5.1	NA	6	18
21	Magovern	USA	1994	61.6	21	4	1.8	4	11	21
22	Saxena	USA	2015	76.8	45	30	4.2	17	11	45
23	Li	China	2015	56.2	73	29	4.4	NA	42	123
24	Yan	China	2010	50.5	18	30	3.1	NA	33	67

Abbreviations: NA not available, pts patients, IABP intra-aortic balloon pump, ECMO extra-corporeal membrane oxygenation, no. numbers, yrs. years

**R Core Team (2013). R: A language and environment for statistical computing. R Foundation for Statistical Computing, Vienna, Austria. URL http://www.R-project.org/