Longitudinal study on adverse pregnancy outcomes and passive smoking during first trimester pregnancy of city women

  Objective   To investigate the distribution of passive smoking in first trimester pregnant women of city, and to study the relationship betw een passive smoking and adverse pregnancy outcomes.

  Methods   Maternal passive smoking status was determined by questionnaire, then two cohorts of passive smoking and non passive soking were gotten.Pregnancy out comes were followed up.Chi Square test and Logistic regression analysis were used.

  Results   The per centage of passive smoking in first trimester pregnant women was 38.2%.The time exposed to passive smoking per day was related with adverse pregnancy outcome.Exposed to passive smoking more than 3 hours per day could highly increase risk of adverse pregnancy outcomes.

  Conclusion   Adverse pregnancy outcomes were associated with passive smoking, especially exposed to passive smoking more than 3 hours per day.Women should be advised to avoid environmental tobacco smoke exposure.