Factors associated with emergency department length of stay in patients who are critically ill

Objective:
This study aimed to determine the factors affecting stay time by analyzing the clinical features of critically sick admitted patients to the emergency department. 
Methods:
This retrospective study included all patients who visited emergency department between January 2018 and December 2019, who had an Emergency Severity Index rating of 1 or 2. Stay time more than or equal to 4 hours and stay time less than 4 hours were the 2 groups into which the patients were split. Various factors were thoroughly examined and contrasted between the two groups. 
Results:
The top five disease categories were nervous system (26.5%), respiratory system (22%), cardiovascular system (14.6%), digestive system (11.7%), and trauma (9.6%). The risk of long stay time was increased with age over 60 years, admission in winter season, diseases of the blood, respiratory, immune system, and tumors. The nervous system, trauma, and the use of invasive ventilation were linked to shorter stay time in the ED. 
Conclusion:
This study could assist ED physicians in better allocating medical resources and evaluating the state of each patient on an individual basis.