Index: LILACS (Americas) Main subject: Epidemiologic Methods / Biostatistics / Statistics as Topic / Data Interpretation, Statistical / Models, Statistical / Epidemiology and Biostatistics / Medicine Type of study: Prognostic study / Risk factors Language: Portuguese Journal: Femina Journal subject: Gynecology / Obstetrics Year: 2010 Type: Article Affiliation country: Brazil Institution/Affiliation country: Faculdade de Medicina de Barbacena/BR