title: Correlates of pre-pregnancy physical inactivity: results from the pregnancy risk assessment monitoring system.
abstract: OBJECTIVE
  Evaluate the prevalence of physical inactivity (no physical activity or exercise for 30 min or more at least one day per week) in the 3 months prior to pregnancy in a population-based sample of women and identify individual socio-demographic, personal, health, and behavioral factors predictive of pre-pregnancy physical inactivity.
  
  
  METHODS
  In this cross-sectional study, we used data from the Centers for Disease Control and Prevention's Pregnancy Risk Assessment Monitoring System to assess the prevalence of self-reported pre-pregnancy physical activity among 4,069 women who delivered a live birth in 2004 in Maine, North Carolina, or Washington State. We developed a predictive model by using a backward selection approach to building logistic regression models to identify independent predictors of physical inactivity in the 3 months prior to pregnancy among those women who did not meet national recommendations for physical activity (activity more than 5 days per week).
  
  
  RESULTS
  Overall, the prevalence of pre-pregnancy physical inactivity was 39.2%. Predictors of physical inactivity prior to pregnancy included higher or lower than normal pre-pregnancy body mass index, lower maternal education level, and a history of previous live births. Women with 12 years of education were particularly likely to be inactive prior to pregnancy (prevalence odds ratio 1.81, 95% confidence interval 1.42, 2.32; compared to women with more than 12 years of education).
  
  
  CONCLUSIONS
  Physical inactivity is common among women prior to pregnancy. Information on factors predictive of physical inactivity can be used in the development of clinical activities and public health interventions that aim to reduce the level of physical inactivity among women of reproductive age.
authors.affiliation: Department of Maternal and Child Health, Boston University School of Public Health, Boston, MA, USA. smad@bu.edu
authors.forename: Sara M A
authors.initials: SM
authors.lastname: Donahue
authors.forename: Frederick J
authors.initials: FJ
authors.lastname: Zimmerman
authors.forename: Jacqueline R
authors.initials: JR
authors.lastname: Starr
authors.forename: Victoria L
authors.initials: VL
authors.lastname: Holt
mesh_terms: D000328:Adult; D003430:Cross-Sectional Studies; D015444:Exercise; D005260:Female; D006304:Health Status; D006801:Humans; D011247:Pregnancy; D018570:Risk Assessment / Q000379:methods*; D014481:United States; D055815:Young Adult