Made available in DSpace on 2022-04-29T08:44:52Z (GMT). No. of bitstreams: 0 Previous issue date: 2014-10-09; Background: Preterm birth rate is increasing and is currently a worldwide concern. The purpose of this study was to estimate the prevalence of preterm birth in a sample of health facilities in Brazil and to identify the main risk factors associated with spontaneous preterm births. Methods and Findings: ...