摘要:This study was conducted in Louisiana DDH, Office of Public Health as a part of my practicum during the period from June to September, 2013. The length between the date of birth and the date of screening was evaluated after excluding new born with no screening records. Estimation of the average days for some risk factors groups including birth weight, gestational age, admission to NICU, APGAR score at 5th minute after birth, method of delivery, and plurality.