Study of factors affecting on neonatal hyperbilirubinemia according of optimization in logistic regression model.

Aim and Back ground: Neonatal hyperbilirubinemia is most common reason to re-admission in hospital. The aim of this study is to investigate effect of risk factors such as hypertension, age and type of delivery in mothers on neonatal hyperbilirubinemia based on logistic regression model. Method and material: In this descriptive study, the 300 mother's documents which refer to hospital for hospitalization their babies were studied. The questionnaire regarding maternal and their neonates were completed and all data were evaluated statistically by logistic method. : The results of this study showed that the affection chance in neonates with mother's 21-30, 31-35 years old and 36 years old and up compare to neonates with their mothers under 20 years old (reference sheet) were about 2.95, 2.15 and 1.92 manifold respectively. The affection chance for    hyperbilirubinemia in neonates with their mothers which have hypertension was 4 manifold compared to neonates with normal mothers. The affection chance for hyperbilirubinemia in neonates with their pre term  mothers (less than 38 weeks) was 1.76 manifold mothers with complete term( more than 38 weeks). The affection chance for hyperbilirubinemia in neonates with their mothers which delivered naturally 1.56 manifold compared to mothers which labored her babies by cesarean section. There is to calculate probability of hyperbilirubinemia in neonates with using of predictive alternatives of mother's age in delivery time, pregnancy hypertension, pregnancy age and type of delivery with logistic regression presentation Conclusion: This study explained that the mother's age in delivery time, pregnancy hypertension, age of gestation and type of labor have effects on neonatal hyperbilirubinemia. The fitting of logistic regression model on studying data and optimization operations  showed that the mother's age under 20 years, without hypertension, term gestation and cesarean delivery have reduce hyperbilirubinemia probability to 26% in neonates.