The hypothesis of the study is that a resuscitation order other than full code is associated with increased mortality among critically ill patients. By incorporating conventional variables associated with death such as age, sex, and Simplified Acute Physiological Score, as well as including the new Clinical Frailty Scale in a statistical model, the aim is to investigate whether there is still an increased risk of death that remains unexplained.

Inclusion Criteria:

• Admitted to ICU

Exclusion Criteria:

• Second or subsequent admission to ICU during the study period.

Critically ill patients admitted to the intensive care unit during 2023 and 2024

The privacy of the data is protected under Swedish law, and the original patient data will be stored in a de-identified form for 10 years in accordance with Karolinska Institute regulations. Use of the de-identified data for research purposes beyond those specified in this registration may be considered, but requires additional approval from the Swedish Ethics Committee.