Figure 3From: Coronary collaterals and risk for restenosis after percutaneous coronary interventions: a meta-analysis Forest plot of risk ratios (RR) for restenosis (≥ 50% diameter stenosis), stratified by measurement method (CFI-based versus visual collateral assessment). Horizontal bars indicate 95% confidence intervals. CCC, coronary collateral circulation; CFI, collateral flow index; CI, confidence interval.Back to article page