title: Methods used in the 1982, 1993, and 2004 birth cohort studies from Pelotas, Rio Grande do Sul State, Brazil, and a description of the socioeconomic conditions of participants' families.
abstract: Three birth cohorts are currently being followed in Pelotas, Southern Brazil, in order to assess changes in birth conditions, growth, development, morbidity, and infant mortality, as well as the influence of pre- and perinatal factors on the subsequent morbidity of participants in their adult lives. We provide a description of the methodology used for the cohort studies that began in 1982, 1993, and 2004 in Pelotas, and a description of the economic conditions of the families involved. For the three cohorts, similar strategies were used to recruit babies born to mothers living in the municipality's urban area. These included daily visits to maternity hospitals where births were identified, mothers interviewed, and newborns examined. Over this time frame, there has been a significant reduction in the number of births due to declining fertility rates amongst the target population. Salaries (measured as a multiple of the minimum wage) were stable across cohorts, but quality of life indicators--such as the availability of piped water, flushing toilets and refrigerators--showed clear improvements. Mothers' levels of education improved markedly. Important changes in the demographic profile of risk factors and health outcomes are being recorded by the Pelotas cohorts.
authors.affiliation: Programa de Pós-graduação em Epidemiologia, Universidade Federal de Pelotas, Pelotas, Brasil. fcbarros.epi@gmail.com
authors.forename: Aluísio J D
authors.initials: AJ
authors.lastname: Barros
authors.forename: Iná S
authors.initials: IS
authors.lastname: Santos
authors.forename: Alicia
authors.initials: A
authors.lastname: Matijasevich
authors.forename: Cora L
authors.initials: CL
authors.lastname: Araújo
authors.forename: Denise P
authors.initials: DP
authors.lastname: Gigante
authors.forename: Ana M B
authors.initials: AM
authors.lastname: Menezes
authors.forename: Bernardo L
authors.initials: BL
authors.lastname: Horta
authors.forename: Elaine
authors.initials: E
authors.lastname: Tomasi
authors.forename: Cesar G
authors.initials: CG
authors.lastname: Victora
authors.forename: Fernando C
authors.initials: FC
authors.lastname: Barros
mesh_terms: D000328:Adult; D001723:Birth Rate; D001938:Brazil / Q000453:epidemiology; D002657:Child Development; D015331:Cohort Studies; D003695:Delivery of Health Care; D005191:Family Characteristics; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007223:Infant; D007226:Infant Mortality; D007231:Infant, Newborn; D018743:Perinatal Care; D012307:Risk Factors; D012959:Socioeconomic Factors; D014505:Urban Population