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Association Between Prenatal Exposure to Tobacco Smoke and Maternal and Neonatal Outcomes: A Retrospective Cohort Study at Motahari Hospital, Urmia
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Amin Bateni1    , Bafrin Shamami1 , Shabnam Vazifehkhah *2 |
1- Urmia University of Medical Sciences, faculty of medicine
2- Urmia University of Medical Sciences, kowasar womens Hospital , Shabnam.vazifekhah@yahoo.com |
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Abstract: (7 Views) |
Background and purpose: Exposure to tobacco smoke is recognized as a preventable risk factor for adverse pregnancy outcomes. This study aimed to investigate the association between prenatal exposure to tobacco smoke and physical growth indicators of newborns at Motahari Hospital, Urmia.
Materials and methods: This retrospective cohort study at Motahari Hospital, Urmia, included pregnant women aged 20–35 with singleton pregnancies at 20–40 weeks gestation during early 2020. Tobacco smoke exposure was assessed via structured telephone interviews due to COVID-19 restrictions. Maternal and neonatal outcomes were extracted from medical records. Sample size (n≈600) was calculated for 99% power based on birth weight differences. Data were analyzed to examine associations between prenatal tobacco exposure and outcomes.
Results: Out of 600 pregnant women, 3.3% of pregnant women smoked and 51.3% were exposed to secondhand smoke. The mean age of the mothers was 28.37 ± 5.22 years. The mean gestational age was 38.17 weeks, which was significantly lower in women exposed to cigarette than women who were not exposed to cigarette (37.9 vs. 38.3.3 weeks with p=0.004). Mean neonatal indices in mothers exposed to cigarette were significantly lower than neonates of mothers who were not exposed to cigarette smoke (height: 48.7 vs. 49.5 cm with P <0.01 Weight: 2970.8 vs. 3317.1 g with P <0.001 Head circumference: 34.3 vs. 34.5 with P = 0.02).
Conclusion: Exposure to environmental tobacco smoke during pregnancy is significantly associated with reduced physical growth indicators in newborns and increased maternal complications. Implementing educational programs aimed at preventing tobacco smoke exposure among pregnant women is essential. |
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| Keywords: Smoking, Pregnancy Outcome, Neonatal Outcome, Maternal Exposure |
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Type of Study: Original |
Subject:
Special
Received: 2025/11/16 | Accepted: 2026/01/5
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