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Letters to the Editor

Type II Error and Antidepressants

J. Bryan Walker, Robert M. Klein, and Sook-Ling Yee

Published: May 1, 2001

Article Abstract

Letter to the Editor

Sir: We read with interest the study conducted by Weihs et al., which concluded that bupropion sustained release and paroxetine were similarly effective in elderly, depressed patients treated for 6 weeks. However, the authors’ failure to observe statistical significance between interventions does not preclude the possibility of a clinically meaningful difference between the 2 agents. We suggest consideration of the possibility of a type II (β) error or a falsely negative trial.

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