Association Between Quality Measures and Mortality in Individuals with Co-Occurring Mental Health and Substance Use Disorders
Published in: Journal of Substance Abuse Treatment, 2016
Posted on RAND.org on June 24, 2016
- Are process-based quality measures associated with decreases in one- and two-year mortality among persons with co-occurring mental illness and substance abuse disorders?
Individuals with co-occurring mental and substance use disorders have increased rates of mortality relative to the general population. The relationship between measures of treatment quality and mortality for these individuals is unknown.
To examine the association between 5 quality measures and 12- and 24-month mortality.
Design, Setting and Participants
Retrospective cohort study of patients with co-occurring mental illness (schizophrenia, bipolar disorder, post-traumatic stress disorder and major depression) and substance use disorders who received care for these disorders paid for by the Veterans Administration between October 2006 and September 2007. Logistic regression models were used to examine the association between 12 and 24-month mortality and 5 patient-level quality measures, while risk-adjusting for patient characteristics. Quality measures included receipt of psychosocial treatment, receipt of psychotherapy, treatment initiation and engagement, and a measure of continuity of care. We also examined the relationship between number of diagnosis-related outpatient visits and mortality, and conducted sensitivity analyses to examine the robustness of our findings to an unobserved confounder.
Main Outcomes Measure
Mortality 12 and 24 months after the end of the observation period.
All measures except for treatment engagement at 24 months were significantly associated with lower mortality at both 12 and 24 months. At 12 months, receiving any psychosocial treatment was associated with a 21% decrease in mortality; psychotherapy, a 22% decrease; treatment initiation, a 15% decrease, treatment engagement, a 31% decrease; and quarterly, diagnosis-related visits a 28% decrease. Increasing numbers of visits were associated with decreasing mortality. Sensitivity analyses indicated that the difference in the prevalence of an unobserved confounder would have to be unrealistically large given the observed data, or there would need to be a large effect of an unobserved confounder, to render these findings non-significant.
Conclusions and Relevance
This is the first study to show an association between process-based quality measures and mortality in patients with co-occurring mental and substance use disorders, and provides initial support for the predictive validity of the measures. By devising strategies to improve performance on these measures, health care systems may be able to decrease the mortality of this vulnerable population.
- Five quality of care measures—treatment initiation, treatment engagement, quarterly provider visits, and receipt of psychosocial or psychotherapy treatment—were used with data from over 140,000 Veterans Administration patients to determine associations with mortality at one and two years.
- The measures showed strong association between more service utilization and decreased mortality, suggesting that interventions to increase service utilization may decrease mortality in this population.
- The two-part quality measure endorsed by the National Quality Forum and the HEDIS (National Committee for Quality Assurance) may be valid for a population of co-occurring disorders.