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## Figure 1.
Forest plot for maternal genotype analysis. The count for genotypes, weight, OR, 95% confidence interval for each study; summary
for each subgroup population; and heterogeneity test statistics are shown. Each square
represents an OR for each specific study, and the area is proportional to the weight.
Each horizontal line shows the 95% CI for each study. The diamonds are the summary
OR for each subgroup population or for the total. The CC genotype is significantly
protective against PTB in women of European descent (OR=0.68, 95% CI 0.51 – 0.91).
It is not significant in heterogeneous populations.
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