Nature and prevalence of combinations of mental disorders an
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The nature and prevalence of combinations of mental disorders and their associations with premature mortality have never been described. the most common combinations of mental disorders and estimate excess mortality associated with these combinations.

A population based cohort study was designed including all 7,505,576 persons. Information on mental disorders and mortality was obtained from national registers. A total of 546,090 individuals (10.5%) were diagnosed with at least one mental disorder during the 22 year follow-up period. The overall crude rate of diagnosis of mental disorders was 9.28 per 1,000 person years. The rate of diagnosis of additional mental disorders was 70.01 per 1,000 person years for individuals with one disorder already diagnosed. At the end of follow-up, 2 out of 5 individuals with mental disorders were diagnosed with two or more disorder types.

The most prevalent were neurotic/stress related/somatoform disorders and mood disorders, which – alone or in combination with other disorders – were present in 64.8% of individuals diagnosed with any mental disorder. Mortality rates were higher for people with mental disorders compared to those without mental disorders. The highest mortality rate ratio was 5.97 for the combination of schizophrenia, neurotic/stress related/somatoform disorders and substance use disorders.

Any combination of mental disorders was associated with a shorter life expectancy compared to the general Danish population, with differences in remaining life expectancy ranging from 5.06 years to 17.46 years. The largest excess mortality was observed for combinations that included substance use disorders. This study reports novel estimates related to the “force of comorbidity” and provides new insights into the contribution of substance use disorders to premature mortality in those with comorbid mental disorders.

Source: https://onlinelibrary.wiley.com/doi/10.1002/wps.20802
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