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Random-effects meta-analysis for odds of preterm birth at less than 37 weeks gestation during the COVID-19 pandemic versus pre-pandemic period. 2.1 Unadjusted odds ratio. 2.2 Studies in high (>median) stringency index regions. 2.3 Studies in low (<median) stringency index. 2.4 Studies with only singleton births. 2.5 Studies including singleton and multiple order births.
