SAMPLE CALCULATIONS SIMPLIFIED BASIC CALCULATIONS …

Among infants who died and were born at less than 24 weeks gestation, only 14 percent of the mothers had a prior preterm birth, but 68 percent had previously been pregnant. 20-23 weeks 26% 24-27 weeks 14% 28-33 weeks 9% 34-36 weeks 10% 37 or more weeks 30% ................
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