Fig. 2

Effect of screening on all-cause death, cardiovascular death, non-fatal myocarial infarction (MI), the composite of cardiovascular death or non-fatal MI. Odds ratios (OR) with 95 % confidence intervals (CI). For each study, the area of the box represents its contribution to the meta-analysis (weight). Numbers of events are shown in the screening group and in the control group. Overall estimates of effects were calculated with a random effect model