Researchers found that the international prevalence of 28-day survival among extremely preterm infants born at 22 weeks to 25 weeks of gestation had the widest variation when all live births were used as the denominator, with rates ranging from 1.8% to 22.3% among those born at 22 weeks' gestation. However, the findings in Pediatrics, based on data from the US and six other developed countries, showed that such variations decreased when stillbirths or live births who survived over 12 hours of life were considered in the denominator.
Study examines global variation in survival rates of extreme preemies
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