ArticleAge and ageing2026
Population-based incidence rate of in-hospital delirium in older adults in Norway-a HUNT study.
Article in Age and ageing, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
backgroundMost studies of delirium occurrence are based on selected hospitalised populations or administrative data. We aimed to estimate the incidence rate of in-hospital delirium in older adults and to assess use of the International Classification of Diseases, 10th Revision (ICD-10) delirium code (F05) in electronic health records.
methodsThis population-based cohort study included 9956 participants aged ≥70 years from HUNT4 70+. Participants were followed from the date of study participation (2017-19) until 31 December 2023. In-hospital delirium was identified by retrospective chart review of all admissions during follow-up, using Diagnostic and Statistical Manual of Mental Disorders, fifth edition criteria. Incidence rates were estimated using the first delirium episode per participant, weighted for non-participation.
resultsDuring follow-up, 1507 participants (15.1%) experienced ≥1 in-hospital delirium episode. The weighted incidence rate was 33.1 (95% CI 31.5-34.9) per 1000 person-years and increased with age from 11.4 (age 70-74) to 109.0 (age ≥90) per 1000 person-years. Men had higher incidence rates than women across age groups. Among admissions with delirium, 11.9% had an ICD-10 discharge delirium diagnosis code (F05).
conclusionIn-hospital delirium was common, increased markedly with age and was rarely captured by diagnostic coding. Low coding rates suggest that routine health-care data substantially underestimate delirium burden. Under-recognition of delirium may limit opportunities for follow-up in a group at high risk of adverse outcomes. With an ageing population, the burden of delirium is likely to increase for individuals and health-care systems. Our findings support systematic approaches to improve identification and management.
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