Prevalence of preterm labor in Iran: A systematic review and meta-analysis.

Int J Reprod Biomed · 2015 · PMC4827509 · PMID 27141533

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a decreasing trendno p-value reported

an increasing trendno p-value reported

While based on the results of the Blencowe et al study, preterm delivery in 184 countries from 1990 to 2010, only 3 countries had a decreasing trend, 14 countries had stable rate and all others showed an increasing trend during 20 years ( 7 ).

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