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Objectives: To establish the validity of the Chinese version of the Athens Insomnia Scale (CAIS) and the diagnostic cutoff scores for insomnia. Methods: Two hundred and eighty-three subjects, consisting of 65 psychiatric outpatients and 218 non-clinical samples, completed the CAIS. The ICD-10 ”nonorganic insomnia” was the diagnostic standard of insomnia, and the Insomnia Self-assessment Inventory (ISAI) was used as the external validator. Both the 8-item scale (CAIS-8) and the brief version containing the first 5 items (CAIS-5) were analyzed. Results: In both versions, the Cronbach's α of internal consistency reached 0.82-0.84. Correlation coefficients of test-retest reliability were 0.84-0.86. The correlation coefficients between the CAIS and ISAI were 0.72-0.76. The CAIS-8 demonstrated two components in factor analysis: items 1 to 5 (nighttime symptoms) and items 6 to 8 (daytime symptoms). The suggested cutoff points for insomnia among this ethnic Chinese population are 8 for the CAIS-8 (AUC=0.89, p＜0.01) and 5 for the CAIS-5 (AUC=0.90, p＜0.01), respectively. Conclusion: The CAIS-8 and CAIS-5 are fair tools in screening and making insomnia diagnoses in clinical practice, and have satisfactory reliability and validity.
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