volume 47, issue 5, P992-1003 2013
DOI: 10.1590/s0034-8910.2013047004997
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Abstract: ABSTRACT OBJECTIVE:To estimate the prevalence of preterm birth by categories of birth weight, and to obtain an equation to correct the estimates. METHODS:Systematic review of the Brazilian literature published from 1990 to 2012, to identify studies with primary collection of data on birth weight and gestational age. Twelve studies were selected and contributed for tabulations of preterm prevalence according to 100 g birth weight categories. These results were combined using sex-specific fractional polynomial …

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