الفهرس 
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Abstract
PTB is a compound phenomenon and it is considered as one of the main reasons of neonatal morbedity and mortality. BMI has been investigated as a factor contributing to its occurrence but the data regarding their association is conflicting. The aim of this study is to find if there is an association between different body mass indexes and the occurrence of preterm. The pregnant patients who delivered preterm live born babies at Mansoura university hospital during a period of one year were recruited in this study. The patients were divided into four groups according to their BMI and their risk factors for preterm birth in each group were statistically analysed. We found that 64.8% of the pregnant women who had preterm birth were overweight and obese. The gestational age at birth decrease significantly with increasing the BMI of the mother. However, Preterm birth is a multifactorial condition and the BMI can be considered as a cofactor. In our study, the other associated risks that increase the occurrence of preterm are the gravidity, parity, the interval between pregnancies and the haemoglobin level. In addition, history of preterm birth, miscarriage, previous caesarean sections and uterine interventions are associated with increased incidence of the preterm birth in the overweight and obese women compared to the underweight and normal weight women. Second and third trimester uterine bleeding also increase the occurrence of the preterm in the obese women.