Validation of the Chinese version of Morningness-Eveningness Questionnaire for screening delayed sleep-wake phase disorder with bipolar disorder among Han Chinese population

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The study validated the Chinese version of the Morningness-Eveningness Questionnaire (MEQ) for screening Delayed Sleep-Wake Phase Disorder (DSWPD) in bipolar disorder patients.
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A total of 267 bipolar disorder patients and 130 healthy controls were assessed using the MEQ to identify DSWPD within the Han Chinese community.
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BD patients with DSWPD scored significantly lower on the MEQ compared to those without DSWPD and healthy controls, indicating the tool's effectiveness.
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The optimal MEQ cut-off score for identifying DSWPD was determined to be 43, with a sensitivity of 0.83 and specificity of 0.75.
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The study concluded that the Chinese version of the MEQ is a reliable and valid screening tool for DSWPD among bipolar disorder patients.

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