Factors associated with smoking continuation or cessation in men upon learning of their partner's pregnancy

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  • 妊娠判明後のパートナーの喫煙行動の変化と関連要因
  • ニンシン ハンメイ ゴ ノ パートナー ノ キツエン コウドウ ノ ヘンカ ト カンレン ヨウイン

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Abstract

Objectives Factors associated with smoking continuation or cessation were analyzed among parents of 4-month-old infants, in order to prepare the basic materials for a smoking cessation support program for pregnant women and their partners. The study focused on the changes in partners' smoking activities upon learning of their partner's pregnancy.<br/>Methods An anonymous self-completed questionnaire was given to parents of 1,198 infants during a 4-month medical checkup in City A of Hyogo prefecture (776 couples) and City B of Gifu prefecture (422 couples). The questionnaire items collected information on age, education, smoking history, current smoking status, and awareness about smoking. The additional items for fathers were occupation, workplace smoking environment, and attitude toward smoking; and the additional items for women were number of children, family composition, and partners' attitudes and behaviors regarding smoking upon learning of their pregnancy. The number of valid answers (for pairs) was 558 (71.9%) in City A and 395 (93.6%) in City B. The data on men who had been smokers before learning of their partner's pregnancy were analyzed. For each area, a comparative item-by-item analysis was performed on data from men who ceased smoking upon learning of the pregnancy (smoking cessation group) and those who continued smoking (smoking continuation group). For logistic regression analysis, the objective variables were the 2 groups, and the explanatory variables were the items showing statistical differences between the groups and the items related to the survey areas.<br/>Results Of the men whose data were included in the analysis, 210 (37.6%) in City A and 204 (51.6%) in City B had been smokers before learning of their partner's pregnancy. Among these, 16 (7.6%) in City A and 26 (12.7%) in City B ceased smoking after learning of the pregnancy. The results of logistic regression analysis showed that the odds ratio for continuing smoking was 2.77 [95% confidence interval (CI): 1.17–6.57] for men with at least 2 children, 0.05 (95% CI: 0.01–0.18) for those who decided to cease smoking immediately, and 0.19 (95% CI: 0.08–0.44) for those who were strongly encouraged to cease smoking by their pregnant partner upon learning of the pregnancy.<br/>Conclusion In male smokers who learned of their partner's pregnancy, men with 2 or more children were more likely to continue smoking, while men who considered quitting smoking immediately upon learning of the women's pregnancy, and those whose pregnant partners strongly encouraged them to do so, were more likely to cease smoking.

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