Table 4.

Results of meta-analysis of studies investigating effect of collaterals on deaths and re-infarctions

Study	Odds collaterals	Odds no collaterals	N	Odds ratio	95 % CI	T-value	P-value
1. Monteiro 2003	6/29	11/24	70	0.45	0.15–1.40	−1.38	0.169
2. Nathou 2006	3/173	20/365	561	0.32	0.09–1.08	−1.84	0.066
3. Meier 2007	36/190	197/389	812	0.37	0.25–0.56	−4.87	0.0001
4. Sorajja 2007	7/112	15/184	318	0.77	0.30–1.94	−0.56	0.576
5. Regieli 2009	7/254	16/600	879	1.03	0.42–2.54	+0.07	0.944
6. Desch 2010	5/64	34/132	235	0.30	0.11–0.81	−2.38	0.018
7. Steg 2010	246/1676	42/209	2173	0.73	0.51–1.04	−1.72	0.085
Pooled odds ratio			5048	0.54	0.43–0.68	−5.22	0.0001

Heterogeneity chi-square value = 10.7317, 6° of freedom, 0.05 < p < 0.10. I-square value = 44.0 % [<50 % cut-off for no heterogeneity]