A comparative study of the effect of body mass index on pregnancy outcomes in normal and overweight women


  • Seeniammal P. Department of Obstetrics and Gynecology, Government Medical College, Calicut, Kerala, India
  • Chellamma V. K. Department of Obstetrics and Gynecology, Government Medical College, Calicut, Kerala, India
  • Umadevi N. Department of Obstetrics and Gynecology, Government Medical College, Calicut, Kerala, India




Overweight, Obesity, Pregnancy


Background: Maternal obesity has been reported as a risk factor for various antepartum, intrapartum, postpartum and neonatal complications. Increasing rates of overweight among pregnant women are a significant public health concern with various implications for prenatal care and supervision of delivery. Therefore, the present study is to determine the adverse materno-fetal outcome in primigravid overweight and obese women delivering singleton babies.

Methods: A prospective comparative study was conducted for a year at IMCH, Medical College, Calicut. Primigravid women with a singleton uncomplicated pregnancy with cephalic presentation at ≥37 weeks of gestation with accurate information regarding height and weight recorded at the booking visit were included in the study. Comparisons were made between 100 women with BMI >25 and 200 women with BMI 18.5-24.9. Statistical analysis was done using SPSS version 16.0. Data was analysed by Pearson Chi square test and Fisher’s exact test.

Results: Overweight mothers are at increased risk quoted as relative risk (RR) and 95% confidence intervals (CI) of adverse materno-fetal outcomes. Gestational hypertension RR 2.39 (CI 1.65-3.47), Gestational diabetes RR 2.67(CI 0.95-7.48), induction of labour RR 2.35 (CI 1.4-3.95), Cesarean section RR 5.73 (CI 3.76-8.73), macrosomia RR 14 (CI 1.75-112.23), NICU admissions RR 4.51(CI 2.61-7.84),perineal lacerations RR 4.72 (CI 1.15-20.4), wound infection RR 2.97 (CI 1.06-8.41), and prolonged hospital stay.

Conclusions: It is clearly evident from the study that maternal overweight and obesity is associated with adverse materno-fetal outcome.


World Health Organization. Obesity: preventing and managing the global epidemic. Geneva (Switzerland): World Health Organization; WHO technical report series; 2000:894.

Third National Family Health Survey. Mumbai: International Institute for Population Sciences. 2006. Available from: http://nfhsindia.org/nfhs3_national_report.html

Bhattacharya S, Campbell DM, Liston WA. Effect of body mass index on pregnancy outcomes in nulliparous women delivering singleton babies. BMC Public Health. 2007;24(7):168.

Anna-Maria Siega-Riz, Barbaria, Laraia. The implications of maternal overweight and obesity on the course of pregnancy and birth outcomes. Matern Child Health J. 2006;10:S153-156.

Sebire NJ, Jolly M, Harris JP. Maternal obesity and pregnancy outcome: a study of 287, 213 pregnancies in London. Int J Obes. 2001;25:1175-82.

Catalano P. Editorial. Obesity and pregnancy-the propagation of a vicious cycle? J Clin Endocrinol Metab. 2003;88(8):3505-6.

Baeten JM, Bukusi EA, Lambe M. Pregnancy complications and outcomes among overweight and obese nulliparous women. Am J Public Health. 2001;91:436-40.

Sara Sukalich, Mingione MJ, Glantz JC. obstetric outcomes in overweight and obese adolescents AJOG. 2006;195:851-5.

Callaway LK, Prins JB, Chang AM, McIntyre HD. The prevalence and impact of overweight and obesity in an Australian obstetric population. Med J Aust. 2006;184:56-59.

Outcome of pregnancy in a woman with an increased body mass index. Usha Kiran TS; Hemmadi S; Bethel J; Evans J BJOG. 2005 Jun;112(6):768-72.






Original Research Articles