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Utility Assessment in Patients with Mental Disorders

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  • Hans-Helmut König
  • Oliver Günther
  • Matthias Angermeyer
  • Christiane Roick

Abstract

Background: Preference-based health-state values, also referred to as utility scores, are considered an important measure of outcome in the evaluation of healthcare. A common approach to elicit utility scores is the use of the time trade-off (TTO) method; however, the data on TTO utility scores in patients with mental disorders are scarce. Objective: To analyse the TTO method in patients with mental disorders in terms of discriminative ability, validity and the refusal to trade life time (zero trade). Methods: In patients with affective (n=172), schizophrenia spectrum (n=166) and alcohol-related (n=160) mental disorders, TTO utilities were administered through a standardized interview. Measures of quality of life (QOL) [EQ-5D, WHOQOL-BREF], subjective (SCL-90R) and objective (CGI-S) psychopathology, and functioning (GAF, GARF, SOFAS, HoNOS) provided comparison. Discriminative ability was analysed by assessing frequency distributions of TTO utilities. Validity was analysed by assessing the correlation of TTO utilities with all other scores. The association of a patient’s QOL, sociodemographic and disease-related variables with zero trade was analysed by logistic regression. Results: Of patients with affective/schizophrenic/alcohol-related mental disorders, 153/143/145 (89/86/91%), respectively, completed the TTO elicitation; 29/43/28% of the respondents were zero traders. The mean TTO utility was 0.66/0.75/0.61 and the median was 0.85/0.95/0.75. TTO utility scores discriminated well among more impaired mental health states, but discrimination was limited among less impaired health states. In patients with affective and alcohol-related mental disorders, TTO utility scores were significantly correlated (mostly moderate: 0.3 > r > 0.5) with all other scores. However, in schizophrenic patients, TTO utility scores were only a little correlated with other subjective measures and not correlated with objective measures. QOL was significantly associated with zero trade; the influence of the other variables on zero trade was negligible. Conclusions: TTO utility scores in patients with affective or alcohol-related mental disorders were reasonably valid, but discriminative ability was compromised by a ceiling effect due to zero trade. In schizophrenic patients, validity of TTO utility scores was not demonstrated. Copyright Adis Data Information BV 2009

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  • Hans-Helmut König & Oliver Günther & Matthias Angermeyer & Christiane Roick, 2009. "Utility Assessment in Patients with Mental Disorders," PharmacoEconomics, Springer, vol. 27(5), pages 405-419, May.
    • Handle: RePEc:spr:pharme:v:27:y:2009:i:5:p:405-419
    DOI: 10.2165/00019053-200927050-00005
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    2. Paul Dolan & Henry Lee & Tessa Peasgood, 2012. "Losing Sight of the Wood for the Trees," PharmacoEconomics, Springer, vol. 30(11), pages 1035-1049, November.

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