Fig. 3From: Patient and hospital factors associated with 30-day readmissions after coronary artery bypass graft (CABG) surgery: a systematic review and meta-analysisSubgroup analysis of 30-day readmission rate after CABG by various study characteristics. The black squares and the horizontal lines indicate pooled estimates from random effect meta-analysis of studies belong to a specific subgroup and the corresponding 95% CIs, respectively. Heterogeneity chi-squares are based on tests of heterogeneity between subgroupsBack to article page