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Six women (2%) who had quit smoking in early pregnancy (questionnaire) were categorized as nonsmokers in the interview.
Additional file 1: Alcohol and Pregnancy Questionnaire.
Completing the pregnancy questionnaire was considered implied consent.
All the following maternal stress instruments were included in the pregnancy questionnaire.
Height was reported on questionnaire 1. Weight was reported at weeks 0 and 15 of pregnancy (questionnaire 1), at week 30 of pregnancy (questionnaire 3), and at delivery and 6 months postpartum (questionnaire 4).
They filled out an extensive pregnancy questionnaire about socio-demographic data, obstetric history, lifestyle, dietary habits, and psychosocial conditions.
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1571 women (73%) completed all three pregnancy questionnaires.
Further attrition of 8.4% occurred between Q2 and Q3 and 1571 participants completed all three pregnancy questionnaires.
1635 (70%) completed a mid-pregnancy questionnaire that assessed depressive symptoms and 1422 (60% of those enrolled) completed a second questionnaire that assessed depressive symptoms at 6 months postpartum.
The mid-pregnancy questionnaire contained questions about work status, occupation and working conditions and focused on the periconception and pregnancy period.
Eligibility, exclusion and response to the post-pregnancy questionnaire is described in figure 2. In total, 3,406 (84%) women received the questionnaire and 2,413 returned it (response 71%).
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