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birth accounts for 75% of all preterm births. This rate is inconsistent across countries. In the United Kingdom, 7.9% of babies are born pre-term, and in the United States, 12.3% of all births are before 37 weeks of gestation. Approximately 0.5% of births are extremely early periviable births (20-25 weeks of gestation), and these account for most of the deaths. In many countries, rates of premature births have increased between the 1990s and 2010s. Complications from preterm births resulted globally in 0.81 million deaths in 2015, down from 1.57

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