BJOG : an international journal of obstetrics and gynaecology
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Comparative Study
Variations in very preterm birth rates in 30 high-income countries: are valid international comparisons possible using routine data?
Concerns about differences in registration practices across countries have limited the use of routine data for international very preterm birth (VPT) rate comparisons. ⋯ International comparisons of VPT rates should exclude births at 22-23 weeks of gestation and terminations of pregnancy.