The hospital stay is a good indicator of the quality of health care among the factors that have affected the severity of the disease, psychosocial and institutional. The optimum stay depends on the characteristics of the patient. The stay average (SA) for Diagnosis Related Groups (DRG) allocating resources in proportion to the complexity of diagnosis and treatment, very important for areas such as neonatology where patients spend prolonged periods in intensive and intermediate care. The study objective was to assess whether risk factors: Apgar at 5 minutes less than 6, perinatal asphyxia, neonatal resuscitation and admission to any type Intensive Care Unit (ICU), are associated with prolongation of the SA in hospitalized patients in the Neonatology Service of Regional Hospital of Trujillo (HRDT) during the period 2011 - 2014. Population and Methods. A study of cases and controls matched ...