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Preterm birth proportions (gestational age at birth <37 weeks, <32 weeks, 32–33 weeks and 34–36 weeks, respectively) by year in the study area in Matlab, Bangladesh. The linear trend equation indicated 2.3% (y=−0.0629x+2.78), 3.3% (y=−0.2037x+6.14) and 2.8% (y=−0.6605x+23.3) annual reduction of very preterm, moderate preterm and late preterm births, respectively.
