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Saturday 09 September 2006

The relationship between quality of life and clinical efficacy from a randomized trial comparing olanzapine and ziprasidone.

By: Phillips GA, Van Brunt DL

Objective: To examine treatment-specific changes in health-related quality of life (QOL) among patients with schizophrenia and to assess the association between clinical and QOL improvement.

Method: This post hoc analysis used the findings of a 28-week, randomized, multicenter trial of patients with schizophrenia (DSM-IV) treated with olanzapine (10-20 mg/day) or ziprasidone (80-160 mg/day). Data were collected from August 2001 to December 2002. Efficacy was measured using the Positive and Negative Syndrome Scale (PANSS).

Quality of life was assessed with the generic health self-administered Medical Outcomes Study Short-Form 36-Item Health Survey (SF-36) and the disease-specific expert-administered Heinrichs-Carpenter Quality of Life Scale (QLS). Mixed-effects-repeated-measures and last-observation-carried-forward approaches were used to assess the effects of treatment on QOL and the association of clinical outcomes to QOL outcomes.

Results: Olanzapine- and ziprasidone-treated patients demonstrated similar improvement from baseline to endpoint on the SF-36 and QLS. All correlations between changes in PANSS scores and the SF-36 were significant (p < .001), ranging from -0.159 to -0.400. All correlations between changes in PANSS scores and the QLS were significant (p < .0001), ranging from -0.286 to -0.603. The correlations between the 2 QOL measures were generally significant but small to moderate in magnitude.

Conclusions: The results of this study indicate that, in patients with schizophrenia, olanzapine and ziprasidone treatment are associated with significant QOL and clinical improvements. Further, the significant correlation between change scores on the PANSS and QOL measures suggests that treatment-related clinical improvements are associated with improved health-related and disease-specific QOL.

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