Externally caused deaths for adults with substance use and mental disorders.

For decades, there have been reports of shorter life expectancy among those with mental illness, especially those with more serious psychiatric disorders. The purpose of this study was to compare the risk of mortality among Medicaid beneficiaries, aged 18-64 years, treated for mental illness to a comparable group who were not mentally ill and to the general population. The data used were from the Massachusetts Division of Medical Assistance and records of deaths from the Department of Public Health in Massachusetts. Individuals treated for both psychiatric illness and substance use disorders (dual diagnoses) were compared separately from those whose treatment was only for a psychiatric disorder. For all Medicaid beneficiaries, the most common causes of death were attributed to heart disease and cancer. When compared to the general population, adjusted odds ratios estimated death by injury to be twice as likely among the mentally ill when compared to the general population. Medicaid beneficiaries with dual diagnoses are 6-8 times more likely to die of injury, primarily poisoning, than their counterparts treated for medical conditions only.