title: Rapid Repeat Pregnancy in Brazilian Adolescents: Interaction between Maternal Schooling and Age.
abstract: OBJECTIVE
  An association between rapid repeat pregnancy (RRP; occurring within a birth interval of up to 24 months) and undesirable obstetric and perinatal outcomes has been shown, especially among adolescents and women without adequate schooling. The objective of this study was to evaluate the effect of the interaction between maternal schooling and age on the incidence of RRP. DESIGN, SETTING, PARTICIPANTS, INTERVENTIONS, AND MAIN OUTCOME MEASURES: A nonconcurrent cohort study was carried out using probabilistic record linkage techniques. The 59,400 linked records of singleton live-born infants delivered in 2002 whose mothers were up to 29 years old and lived in Rio de Janeiro City were evaluated.
  
  
  RESULTS
  Compared with young adults with adequate schooling, the adjusted risk ratio for RRP for adolescents with inadequate schooling was 2.1 (95% confidence interval, 1.8-2.4). The attributable proportion was 0.16 (95% confidence interval, 0.02-0.29).
  
  
  CONCLUSIONS
  Young maternal age and inadequate schooling interact, increasing RRP.
authors: Institute of Studies of Public Health, Federal University of Rio de Janeiro, Rio de Janeiro, Rio de Janeiro, Brazil. Electronic address: claulima1979@gmail.com.
authors: Cláudia Lima
authors: CL
authors: Vieira
authors: Institute of Studies of Public Health, Federal University of Rio de Janeiro, Rio de Janeiro, Rio de Janeiro, Brazil.
authors: Patricia V
authors: PV
authors: Flores
authors: Rio de Janeiro State University, Instituto de Medicina Social, Rio de Janeiro, Brazil.
authors: Kenneth
authors: K
authors: Rochel de Camargo
authors: Institute of Studies of Public Health, Federal University of Rio de Janeiro, Rio de Janeiro, Rio de Janeiro, Brazil.
authors: Rejane S
authors: RS
authors: Pinheiro
authors: Department of Maternal and Child Health of the Public Health School of USP (FSP-USP), Universidade de São Paulo, Faculdade de Saúde Pública, São Paulo, São Paulo, Brazil.
authors: Cristiane S
authors: CS
authors: Cabral
authors: Institute of Studies of Public Health, Federal University of Rio de Janeiro, Rio de Janeiro, Rio de Janeiro, Brazil.
authors: Fernanda P
authors: FP
authors: Aguiar
authors: Institute of Studies of Public Health, Federal University of Rio de Janeiro, Rio de Janeiro, Rio de Janeiro, Brazil.
authors: Claudia M
authors: CM
authors: Coeli
mesh_terms: D000293:Adolescent; D000328:Adult; D001938:Brazil / Q000453:epidemiology; D002648:Child; D015331:Cohort Studies; D004522:Educational Status; D005260:Female; D020073:Gravidity; D006801:Humans; D015994:Incidence; D008423:Maternal Age; D016017:Odds Ratio; D011247:Pregnancy; D011256:Pregnancy Outcome; D011253:Pregnancy in Adolescence / Q000706:statistics & numerical data*; D013997:Time Factors; D055815:Young Adult
keywords: Additive interaction; Rapid repeat pregnancy; Schooling; Teenage pregnancy