“…Our mortality rate was high, and the age-adjusted Charlson comorbidity index indicates that our sample of patients was sicker than population in other PN studies, probably justifying the higher mortality. 26 , 27 This comorbidity metrics is the most commonly studied prognostic measure of illness burden in clinical research 28 and is probably related to increased rates of chronic disease and mortality. 29 , 30 , 31 Our study failed to identify prolonged hospitalization or PN time as independent factors to justify this rate.…”