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Forrest plot showing individual and combined effect size estimates and 95% CIs in the studies that evaluated the effect of antenatal indomethacin on periventricular leukomalacia. The weighting ( ) given to the study in the overall pooled estimate, taking into account the number of subjects and the amount of between-study variation (heterogeneity). Error bars (−) indicate 95% CIs. The rhombus indicates combined effect size of 2.08.
