International Journal of
Medicine and Medical Sciences

  • Abbreviation: Int. J. Med. Med. Sci.
  • Language: English
  • ISSN: 2006-9723
  • DOI: 10.5897/IJMMS
  • Start Year: 2009
  • Published Articles: 531

Full Length Research Paper

The correlation of pre-pregnancy body surface area and the rate of cervical dilation in term nulliparous women

Fariba Mirblook
  • Fariba Mirblook
  • Guilan University of Medical Sciences, Department of Obstetric Gynecology, Iran.
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Mitra Ahmad Soltani
  • Mitra Ahmad Soltani
  • 56-Shariaty All- Kord St- Ressalat highway, Tehran, Iran.
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  •  Accepted: 12 October 2009
  •  Published: 30 November 2009


The objective of this study is to examine the correlation of maternal body surface area with cervical dilation in nulliparous women at term. Data from nulliparous women with a term pregnancy referred to Al-Zahra Maternity Hospital in Rasht were collected from November 2008 - May 2009. Inclusion criteria were: singleton pregnancy, nulliparity, estimated fetal weight of less than 4000 g, gestational age of 37 - 41 weeks, pre-pregnancy BMI of less than 30 kg/m², no history of medical disorders, no probable CPD, contractions of at least 3/10 min of more than 45 s duration, Bishop score of more than 10, vertex presentation, occiput anterior position and at least two dilation measurements on vaginal examinations by one person within one hour. Results showed that cervical dilation had a positive correlation with body surface area (r = 0.21, p < 0.012). It is concluded that maternal pre-pregnancy body surface area was independently affecting labor duration in the subjects studied.

Key words: Maternal pre pregnancy Body Surface Area, Active phase, Rate of cervical dilation, duration of labor, Body Mass Index, Rohrer Index.