| Summary: | Abstract Background: The socioeconomic factors have an impact on case mix and outcome in critical illness, but how these factors affect the use of intensive care is not studied. The aim of this study was to evaluate the incidence of intensive care unit (ICU) admissions in patients from residential areas with different annual incomes. Methods: Single‐center, retrospective study in Northern Finland. All the non–trauma‐related emergency admissions from the hospital district area were included. The postal codes were used to categorize the residential areas according to each area’s annual median income: the low‐income area, €18,979 to €28,841 per year; the middle‐income area, €28,879 to €33,856 per year; and the high‐income area, €34,221 to €53,864 per year. Results: A total of 735 non–trauma‐related admissions were included. The unemployment or retirement, psychiatric comorbidities and chronic alcohol abuse were common in this population. The highest incidence, 5.5 (4.6–6.7)/1000/year, was in population aged more than 65 years living in high‐income areas. In working‐aged population, the incidence was lowest in high‐income areas (1.5 (1.3–1.8/1000/year) compared to middle‐income areas (2.2 (1.9–2.6)/1000/year, P = 0.001) and low‐income areas (2.0 (1.7–2.4)/1000/, P = 0.009). Poisonings were more common in low‐income areas. There were no differences in outcome. Conclusion: The incidence of ICU admission in working‐aged population was 25% higher in those areas where the annual median income was below the median annual income of €38,775 per inhabitant per year in Finland.
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