1Trauma Nursing Research Center, Kashan University of Medical Sciences, Kashan, IR Iran
2Department of Midwifery, Tarbiat Modares University, Tehran, IR Iran
3Department of Midwifery, Kashan University of Medical Sciences, Kashan, IR Iran
Background Maternal passive smoking or exposure to environmental tobacco smoke may be a risk factor for maternal and newborn morbidity. Objectives The current study aimed to assess the relationship between preterm delivery and tobacco smoke exposure in pregnant woman referring to the Shabih-Khani maternity hospital in Kashan, Iran. Patients and Methods An analytical retrospective cohort study was conducted on 300 non-smoker pregnant women in two groups of passive smoking and non- passive smoking. Passive smoking was defined as exposed to smoking of 5 or more cigarettes per day during pregnancy at home. Preterm delivery compared between passive smoking and non-passive smoking groups. Results Preterm delivery in the passive smoking group was more than non-passive smoking group (10% versus 6%, P = 0.2), this difference was not significant. Gestational age was similar in the two groups (38.96 ± 1.56 and 38.99 ± 1.42 weeks in the passive and non-passive smoking groups respectively). Conclusions Preterm delivery in the exposed group was more than non-exposed group, but difference was not significant.