The Effect of Pre-Pregnancy Maternal Body Mass Index on Pregnancy Outcomes in Nulliparous Women

Introduction: Studies have shown that abnormal body mass index of mother at the onset of pregnancy and even before pregnancy and as well as inadequate weight gain during of pregnancy effects on pregnancy outcomes .This study was conducted to evaluate the effect of pre-pregnancy BMI on pregnancy outcomes.Methods: In this study, BMI was measured in 360 nulliparous women. According to BMI, pregnant women were placed into three groups: groupΙ(lean group BMI≤19/8),groupΙΙ (normal weight group BMI=19/9-24/9), and group ΙΙΙ (obese group≥25). Data were analyzed using SPSS16.Results: showed that the mean duration of the first and the second stage of labour were significantly different between three groups(p<0.001).Cesarean section ratio in groupΙ was lower than group ΙΙ ( OR=0.15;p=0.013). Instrumental delivery in group ΙΙΙ was more than groupΙΙ (OR=4.6;p=0.002). Risk of nonreactive non-stress test(NST) was significantly different between groupsΙΙ and ΙΙΙ (OR=5.7;p=0.009). Induction ratio in group Ι was lower than group ΙΙ (OR=0.43;p=0.002).Conclusion: Deviation of BMI from the normal level is associated with adverse outcomes of pregnancy and delivery.

کلیدواژه ها:

Body mass index ، Pregnancy outcomes ، Nulliparous women