Coronary collaterals and risk for restenosis after percutaneous coronary interventions: a meta-analysis.

When considering studies with highest quality only (based on the Newcastle-Ottawa Scale; at least seven of eight points), the estimate for RR for restenosis for the group with good collaterals was very consistent but did not reach statistical significance (1.47 (95% CI 0.78 to 2.76); P = 0.235 (heterogeneity: tau 2 < 0.001; I 2 = 0%, P = 0.866)); three studies were considered in this analysis [ 5 , 6 , 24 ].

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