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In this research, the cox proportional hazard model and the semi-parametric gamma frailty model were compared on the survival of premature infants admitted to neonatal intensive care unit from December 29, 2011 to April 6, 2014. A retrospective study design was used to collect the data from patients chart.Read More At www.omicsonline.org/open-access/survival-analysis-of-premature-infants-admitted-to-neonatal-int-ensivecare-unit-nicu-in-northwest-ethiopia-using-semiparametric-fr-ailtymodel-2155-6180-1000223.php