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. 2016 Aug 5;6:30732. doi: 10.1038/srep30732

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(a) Forest plot for univariate analysis of 18 studies examining the effect of overall gestational hypertensive disorder on ROP (any type). The bars with squares in the middle represent 95% confidence intervals (95% CIs) and odds ratios (ORs). The central vertical solid line indicates the ORs for null hypothesis. (b) Forest plot for multivariate analysis of 10 studies examining the effect of overall gestational hypertensive disorder on ROP (any type). The bars with squares in the middle represent 95% confidence intervals (95% CIs) and odds ratios (ORs). The central vertical solid line indicates the ORs for null hypothesis.