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. 2016 Feb 18;5(2):e002802. doi: 10.1161/JAHA.115.002802

Figure 4.

Figure 4

Summary analysis of postoperative all‐cause mortality stratified by the off‐pump coronary artery bypass (OPCAB) technique. Each square denotes the RR for the within‐study comparison with the horizontal lines showing the 95% CI. The size of the square is directly proportional to the statistical weight of each study. The black diamond shapes give the pooled RR from the random‐effects model; the center of the diamond denotes the RR and the extremities the 95% CIs. IV indicate inverse variance.