It is important to find out how much of the socioeconomic factors´ impact on mortality on ICU patient´s can be explained by the presence of comorbidity. The aim of this study is to clarify the impact of socioeconomic factors on mortality and how much of this effect are due to comorbidity in the intensive care population.

The first ICU admissions of patients aged 30 years and older, registered in the Swedish Intensive Care Registry (SIR) from 2009 to 2012 were included. SIR was linked to the National Patient Register, Statistics Sweden and the Cause of Death Register using unique person identity numbers. Educational level and disposable income was reported in the year preceding the admission to intensive care to not be affected by the current illness.

Inclusion Criteria:

• Registered in the Swedish Intensive Care Registry (SIR) from 2009 to 2012.
• The first ICU admission
• Patients aged 30 years and older

Exclusion Criteria:

• Missing registration of educational level
• Missing registration of income

The first ICU admissions of patients aged 30 years and older, registered in the Swedish Intensive Care Registry (SIR) from 2009 to 2012.

It is a register-based study where all the data are deidentified.