The thought disorder questionnaire.

OBJECTIVE: To describe the development of the Thought Disorder Questionnaire (TDQ), including data on reliability and validity, and to explain the questionnaire's feasibility and diagnostic accuracy. METHODS: The TDQ has 6 scales, each with 10 items (on a scale from 0 [for never] to 4 [for always]). The 6 scales measure content of thought, control of thought, orientation, perception, fantasy, and symptoms. RESULTS: The TDQ is a reliable 60-item, self-report questionnaire that measures the quantity and quality of disordered thinking in patients with mental disorders. It has established reliability and validity. CONCLUSION: The TDQ's clinical and research utility remains to be determined.