RESUMEN
This study was conducted to evaluate the effect of pre-pregnancy BMI on pregnancy outcomes. BMI was calculated measured in 360 nulliparous women. According to BMI, pregnant women were placed into three groups: group I [lean group BMI . 19.8], group II [normal weight group BMI = 19.9.24.9], and group III [obese group BMI . 25]. Data were analyzed using SPSS 16. 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 group I was lower than group II [OR = 0.15; P = 0.013]. Instrumental delivery in group III was more than group II [OR=4.6; P = 0.002]. Risk of nonreactive non-stress test [NST] was significantly different between groups II and III [OR = 5.7; P = 0.009]. Induction ratio in group I was lower than group II [OR=0.43; P = 0.002]. Deviation of BMI from the normal level is associated with adverse outcomes of pregnancy and delivery