ObjectiveThis study aimed to analyze factors associated with patient mortality in COVID-19 patients hospitalized in the intensive care unit (ICU) and provide data to help prioritize the most critical patients.DesignRetrospective cohort studySetting and participantsData for 289 patients were analyzed by the XXX hospital’s IT department.MethodsA clinical retrospective cohort study was conducted in a tertiary hospital. Patients (n=289) with negative reverse transcription-polymerase chain reaction (RT-PCR) and positive chest computed tomography (CT) scan indicating COVID-19 were included in the research. Demographics, clinical characteristics, treatment modalities, and length of hospital stay were analyzed in relation to 30-day survival outcomes.ResultsThe mean age of the patients was 69.04±15.10 years (range 19-100), and 41.2% (n=119) were female. The mortality rate was 48.1% (n=139). There were statistically significant differences in laboratory findings, such as hemoglobin (p=0.021), lymphocyte counts (p=0.046), d-dimer (p=0.009), and lactate (<0.001) regarding one-month survival. Additionally, those hospitalized for more than 5 days had higher one-month survival rates (hazard ratio (HR)= 0.003, CI= 10.264-155.972). Moreover, intubated patients had a higher mortality risk during this period (HR=4.15, CI=1.53-11.20).Conclusions and implicationsThe first five days of patients hospitalized in intensive care units due to COVID-19 pneumonia are critical. Besides, the need for intubation was another factor independently affecting survival. Clinicians should be alerted about the significance of these factors.