Document Type : Original Article


Department of Biostatistics, Health Faculty, Kashan University of Medical Sciences, Kashan, Iran


BACKGROUND: Length of stay (LOS) and patients’ outcome are two important indicators in intensive
care units (ICUs). The severity of illness influences these variables and could have a predictive value
in clinical settings. The impact of severity of illness on the LOS and outcomes in patients admitted
to ICUs was investigated in a selected hospital in Iran in 2019.
MATERIALS AND METHODS: This research was a descriptive longitudinal study. Data were
prospectively collected on 150 patients. The sequential organ failure assessment (SOFA) score, LOS,
and demographic variables of the patients were recorded. Abbreviated mental test and Barthel index
measuring activities of daily living questionnaires were completed at the time of the discharge from
ICU and 1 month later to show the patient outcomes. Data analysis was performed using Chi‑square
test, t‑test, analysis of variance, Pearson’s correlation, and linear and ordinal logistic regression with
SPSS software version 16.
RESULTS: The mean of LOS was 11.21 ± 10.54 days. 24.7% of the patients were discharged from
ICUs with optimal recovery, 49.3% with poor recovery, and 26% died in ICUs. One month after
discharge, 67.6% of patients had optimal recovery, 24.3% had poor recovery, and 8.1% died. The
SOFA score had a significant relation with LOS and patient outcomes in discharge and 1 month later.
All the patients with SOFA score <5 survived, and all the patients with SOFA score more than 12 died.
CONCLUSIONS: The severity of illness had a significant relation with LOS and patient outcomes in
the time of the discharge from ICU and 1 month later. It seems that the initial SOFA score of 12 and
higher can be suggested as a cutoff point for poor prognosis in ICU patients.


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