title: Association between body mass index (BMI) and duration of pregnancy in women referred to Shariati Hospital in Bandar Abbas.
abstract: BACKGROUND
  Prolonged pregnancy is associated with increased risk of pregnancy complications. The role of body mass index (BMI) is not completely identified in the risk of occurrence of prolonged pregnancy. The aim of this study was to determine the association between BMI and duration of pregnancy in woman referred to the Shariati Maternity Hospital in Bandar Abbas (Hormozgan Province, Iran).
  
  
  METHODS
  This cross-sectional study was carried out on 1100 pregnant women referred to the Shariati Hospital in Bandar Abbas in 2015. Gestational age determined by last menstrual period (LMP) or first-trimester ultra-sonography. The women were divided into two groups of less than 40 weeks of gestation and more than 40 weeks of gestation. The women were divided based on their BMI at the first trimester of pregnancy into four groups, including less than normal, normal, overweight, and excess weight. Data were analyzed using ANOVA, Mann-Whitney test, and chi-square test by SPSS version 16.0.
  
  
  RESULTS
  The average age of mothers studied was 23 ± 4.30 years. Average of gestational age was 39 ± 1.85 weeks. Among the study participants 1020 (92.7%) had term pregnancies, 53 (4.8%) had preterm pregnancies, and 27 (2.5%) had post-term pregnancies. Also among the study participants, 40% had a BMI less than 19.8 kg/m2, 45.9% had BMI between 19.8 and 26 kg/m2, and 9.8% had BMI between 26.1 and 29 kg/m2, and 4.3% had BMI less than 29 kg/m2. Mean BMI was 20.95 ± 4.02 for women with gestational age of equal to or less than 40 weeks and 23.34 ± 4.52 for women with gestational age of more than 40 weeks. Duration of pregnancy was significantly higher in women with higher BMI at the first trimester (p<0.00006).
  
  
  CONCLUSIONS
  High BMI of a mother in the first trimester of pregnancy is associated with prolonged pregnancy and may increase the risk of post-term pregnancy. Women are recommended to reach an ideal weight before pregnancy to decrease the risk of the pregnancy complications.
authors.affiliation: M.Sc. of Midwifery, Faculty Member, Department of Midwifery, Faculty of Nursing, Midwifery and Paramedicine, Mother & child Welfare Research Center and Midwifery, Hormozgan University of Medical Sciences, Bandar Abbas, Iran.
authors.forename: Arefeh
authors.initials: A
authors.lastname: Shahi
authors.affiliation: M.Sc. of Midwifery, Faculty Member, Department of Midwifery, Faculty of Nursing, Midwifery and Paramedicine, Mother & child Welfare Research Center and Midwifery, Hormozgan University of Medical Sciences, Bandar Abbas, Iran.
authors.forename: Fatemeh
authors.initials: F
authors.lastname: Dabiri
authors.affiliation: M.Sc. of Midwifery, Faculty Member, Department of Midwifery, Faculty of Nursing, Midwifery and Paramedicine, Mother & child Welfare Research Center and Midwifery, Hormozgan University of Medical Sciences, Bandar Abbas, Iran.
authors.forename: Azita
authors.initials: A
authors.lastname: Kamjoo
authors.affiliation: M.Sc. of Midwifery, Faculty Member, Department of Midwifery, Faculty of Nursing, Midwifery and Paramedicine, Mother & child Welfare Research Center and Midwifery, Hormozgan University of Medical Sciences, Bandar Abbas, Iran.
authors.forename: Asieh Pormehr
authors.initials: AP
authors.lastname: Yabandeh
authors.affiliation: M.Sc. of Nursing, Faculty Member, Department of Nursing, Faculty of Nursing, Midwifery and Paramedicine, Hormozgan University of Medical Sciences, Bandar Abbas, Iran.
authors.forename: Zahra
authors.initials: Z
authors.lastname: Khademi
authors.affiliation: Ph.D. of Health Information Management, Assistant Professor, Department of Health Information Technology, Faculty of Paramedicine, Hormozgan University of Medical Sciences, Bandar Abbas, Iran.
authors.forename: Nasrin
authors.initials: N
authors.lastname: Davaridolatabadi
keywords: Body mass index (BMI); Duration of pregnancy; Prolonged pregnancy