ramazan fallah - Zanjan University of Medical Sciences
alireza shoghli - Zanjan University of Medical Sciences
asghar Marzban - Zanjan University of Medical Sciences
mansor Sadeghzadeh - MD, Dept. of Pediatrics, Assistant Professor, School of Medicine, Zanjan University of Medical Sciences, Zanjan, Iran
nima motamed - MD. Dept. of Health Care Management, Zanjan Social Health Research Center, Zanjan University of Medical Sciences, Zanjan, Iran

Background: Low birth weight is one of the key indicators to assess the health of infants, and appropriate birth weight is one of the most important goals of any health system which also reflects the quality of prenatal care. Objectives: The present research aimed to study some of the factors associated with low birth weight using quantile regression analysis. Methods: A cross-sectional study was carried out on ۶۲۱ infants born weighing less than ۲۵۰۰ grams in the period ۲۰۱۲-۲۰۱۳. The data were collected from the medical records of infants in health care centers of Zanjan Province which were selected based on multi-stage cluster sampling. The obtained data were statistically analyzed using quantile and multiple regression analysis in SAS-۹.۲. Results: In this study, ۳۲۰ infants (۵۱.۵%) were female, and the mean age of mothers and the mean weight of infants were ۲۷.۱±۵.۸ years and ۲۲۳۶±۲۹۹ grams, respectively. The results showed that low birth weight is significantly related to age, educational attainment, and the number of children. In addition, there was a significant relationship between infant weight and maternal age only in the tenth percentile (P=۰.۰۰۷), while such a relationship was not found in the higher percentiles (۵۰ and ۹۰) (P=۰.۰, ۹۵۳.۵۸۵). Conclusion: Some of the demographics of mothers such as educational attainment and gestational age were influential in the low birth weight of infants. Maternal age and birth weight were not statistically significant in all areas.

Risk factors, Low birth weight, Quantile regression analysis