Figure 2From: Coronary collaterals and risk for restenosis after percutaneous coronary interventions: a meta-analysis Forest plot of risk ratios (RR) for restenosis (≥ 50% diameter stenosis). Markers represent point estimates of risk ratios, marker size represents study weight in random effects meta-analysis. Horizontal bars indicate 95% confidence intervals. CCC, coronary collateral circulation; CI, confidence interval.Back to article page