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  • Title: The cumulative effects of quality improvement for depression on outcome disparities over 9 years: results from a randomized, controlled group-level trial.
    Author: Wells KB, Sherbourne CD, Miranda J, Tang L, Benjamin B, Duan N.
    Journal: Med Care; 2007 Nov; 45(11):1052-9. PubMed ID: 18049345.
    Abstract:
    BACKGROUND: Quality improvement (QI) programs for depression can improve outcomes of care and reduce outcome disparities; but cumulative effects on mental health outcome disparities have seldom been evaluated. OBJECTIVE: To estimate cumulative effects over many years of short-term QI programs for depression in primary care on mental health outcome disparities, and to develop an interpretation for annualized, cumulative mental health outcome scores. DESIGN: : We conducted a group-level, randomized controlled trial in 6 US healthcare organizations. The QI programs supported provider and patient education in depression treatment and resources for medication management (QI-Meds) or access to evidence-based psychotherapy (QI-Therapy). Sites were selected to oversample minorities. PATIENTS: Results were extrapolated to 1188 initially enrolled and living patients depressed at baseline. MAIN OUTCOME: Psychologic well-being (MHI-5) estimated as cumulative outcomes and outcome disparities (minority-whites) over 9 years, and annualized. RESULTS: Across analyses there was a significant interaction of intervention status and ethnicity [lowest F(2,160) = 4.96, P = 0.008]. QI-therapy improved cumulative outcomes among minorities (mean, 37.92-44.29 MHI-5 points) and reduced outcome disparities for the whole sample relative to usual care (UC) (by mean, 39.44-59.01 MHI-5 points) and relative to QI-Meds (by mean, 53.90-74.41 MHI-5 points), lowest t(103) = 3.12, P = 0.002. By comparison, UC patients who lost a loved one in the year after baseline had lower psychologic well being by 6.18 MHI-5 scale points compared with similar UC patients without such a loss [t(15)=2.52, P = 0.02]. CONCLUSIONS: QI programs incorporating support for evidence-based psychotherapy offer an approach to substantially reduce cumulative outcome disparities for depressed primary care patients.
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