Impact of Unintended Pregnancy on Maternal and Neonatal Outcomes

  • Reza Omani-Samani
  • Mehdi Ranjbaran
  • Maryam Mohammadi
  • Arezoo Esmailzadeh
  • Mahdi Sepidarkish
  • Saman Maroufizadeh
  • Amir Almasi-Hashiani
Original Article



Pregnancy outcomes might be affected by unintended pregnancy such as preeclampsia, preterm birth, cesarean section and low birth weight. The aim of the present study is to assess the association between unintended pregnancy and pregnancy outcomes.


This was a cross-sectional study conducted in 103 hospitals in Tehran, Iran, in July 2015. The data were collected by trained midwives. The interested independent variable was unintended pregnancy and also preeclampsia, weight gain during pregnancy, preterm birth, cesarean section and low birth weight were considered as interested outcomes, and the association of unintended pregnancy and interested outcomes were assessed.


Out of 5152 cases, 1021 (19.82%) cases were unintended pregnancy. There was no significant relationship between unintended pregnancy and low birth weight (adjusted OR 0.67, 95% CI 0.403–1.13, P = 0.138), the risk of preterm birth (adjusted OR 1.15, 95% CI 0.850–1.57, P = 0.351) and preeclampsia (adjusted OR 1.21, 95% CI 0.846–1.75, P = 0.289). The results of multiple linear regression model showed that the mean difference between two groups was 0.70 kg, and weight gain mean in unintended pregnant women significantly was lower than unintended pregnant women (mean difference = 0.70, 95% CI 0.14–1.26 kg, P = 0.014). Multiple logistic regression showed that after adjusting confounders, there was a significant relationship between unintended pregnancy and cesarean section, and the adjusted odds of cesarean section in unintended pregnant women was 1.32 times of intended pregnant women (95% CI 1.07–1.63, P = 0.009).


We found higher risk of cesarean section and inappropriate weight gain during pregnancy as adverse outcomes of unintended pregnancy in adjusted model.


Gestational weight gain Preterm birth Low birth weight Cesarean delivery Unintended pregnancy 



This project was financially supported by Royan Institute. We thank all pregnant women participated in this study.


This project was funded by Royan Institute.

Compliance with Ethical Standards

Conflict of interest

ROS has received research grants from Royan Institute. All authors report no conflict of interest.

Ethical approval

The study was approved by the Ethical Committee of Royan Institute. All procedures performed in studies involving human participants were in accordance with the ethical standards of the research institution and/or nationwide research committee and in compliance with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.


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Copyright information

© Federation of Obstetric & Gynecological Societies of India 2018

Authors and Affiliations

  1. 1.Department of Epidemiology and Reproductive Health, Reproductive Epidemiology Research Center, Royan Institute for Reproductive BiomedicineACECRTehranIran
  2. 2.Department of Obstetrics and GynecologyZahedan University of Medical SciencesZahedanIran

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