Preliminary test for the Chinese version of the Morningness-Eveningness Questionnaire

The original English Morningness-Eveningness Questionnaire (MEQ) was translated into Chinese, and the circadian rhythmicity of 188 healthy Chinese subjects was tested using this version of the MEQ. We assessed the reliability and validity of the Chinese version and determined the cut-off points. In the Chinese version, 19 items were divided into two dimensions (i.e., sleep phase and time of greatest efficiency), and the cut-off points were determined to be the following: definitely evening type (142–46), moderately evening type (472–52), neither type (532–64), moderately morning type (652–69), and definitely morning type (702–86). Additionally, the Cronbach a coefficient was determined to be 0.769, which is satisfactory. The Chinese version of the MEQ has good psychometric properties, and its cut-off points can effectively differentiate between morningness and eveningness.