Table 1.

Baseline characteristics of included trials

Study	Year	N	Setting	PCI	Age (years)	Male (%)	Smoking (%)	Hypertension (%)	Hypercholesterolaemia (%)	Diabetes (%)	Previous AMI (%)
Antoniucci	2002	1164	Acute MI	Yes	63 vs 64	82 vs 77	NR	36 vs 32	26 vs 25	11 vs 16	15 vs 12
Monteiro	2003	70	Acute MI	Yes	63.3 vs 65.3	89 vs 86	46 vs 46	57 vs 60	43 vs 23	17 vs 11	37 vs 57
Elsman	2004	1059	Acute MI	Yes	59 vs 59	83 vs 83	48 vs 49	25 vs 22	21 vs 16	5 vs 7	13 vs 11
Meier	2007	845	Elective	Yes	61 vs 62	79 vs 76	45 vs 35	49 vs 58	61 vs 54	17 vs 15	14 vs 21
Sorajja	2007	318	Acute MI	Yes	60 vs 59	78.2 vs 8.4	41.2 vs 39.2	34.5 vs 38.9	27.7 vs 25.6	15.1 vs 9.5	11.8 vs 11.6
Regieli	2009	879	Elective	Yes	57 vs 56	30 vs 70	89 vs 88	28 vs 28	NR	NR	61 vs 42
Desch	2010	235	Acute MI	Yes	64 vs 66	74 vs 76	46 vs 41	65 vs 70	84 vs 86	33 vs 25	14 vs 14
Steg	2010	2173	Subacute MI	Yes	57.9 vs 60.4	74 vs 80	44 vs 26	44 vs 57	50 vs 52	14 vs 30	13 vs 14
Ilia	2011	81	Acute MI	Yes	54 vs 59	35 vs 24	20 vs 16	16 vs 14	24 vs 17	10 vs 10	NR

Demographics and risk factors are presented for patients with and without coronary collateral circulation, respectively

AMI acute myocardial infarction; MI, myocardial infarction; NR not reported