Contrast use in relation to the arterial access site for percutaneous coronary intervention: A comprehensive meta-analysis of randomized trials

Figure 3 Forest plot showing weighted mean difference of contrast use. The size of the square represents the weight that the corresponding study exerts in the meta-analysis. The larger the square, the more the study contributes to the overall estimate. Diamonds indicate the overall summary estimate for the analysis, its width representing the 95%CI. TRA: Trans-radial access; TFA: Trans-femoral access.