Fatemeh Salmani - Department of Biostatistics, Faculty of Paramedical Sciences, Students’ research committee, Shahid Beheshti University of Medical Sciences,Tehran, Iran
Alireza Abadi - Department of Community Medicine, Faculty of Medicine,Shahid Beheshti University of Medical Sciences, Tehran, Iran
S.Mahmoud Taheri - Faculty of Engineering Science, College of Engineering, University of Tehran, Tehran, Iran
Hamid Alavi Majd - Department of Biostatistics, School of Paramedical Sciences, Shahid Beheshti University of Medical Sciences, Tehran, Iran
Fatemeh Nayeri - Maternal, Fetal and Neonatal Research Center, Tehran University of Medical Sciences, Tehran, Iran

Background: Neonatal hypothermia is a major risk factor for mortality after delivery. The present study aims to identify the risk factors associated with transition in hypothermia state with new definition of hypothermia states. Methods: A total of ۴۷۹ neonates hospitalized in Neonatal Intensive Care Unit of ValiasrHospital, Tehran, Iran, in ۲۰۰۵, participated in the study. The rectal temperature of neonates were measured immediately after delivery and every ۳۰ min afterwards, until their temperature became normal.Results: The mean weight of neonatal was ۲۵۸۰±۸۸۲.۹ grams and the mean of delivery room temperature was ۲۹.۲±۱.۴۵ °C. Most of the neonates had mild hypothermia. There were significant associations between the weight of neonate, Cardiopulmonary Resuscitation, and Apgar scores and hypothermia state (P<۰.۰۵). Also, death of neonates was related to hypothermia state.Conclusion: Findings of the current study indicated that a major risk factor for hypothermia was low weight of the neonates.

Neonatal; Hypothermia; Temperature; Fuzzy transition model