The Content and Convergent Validity of the Persian Morningness-Eveningness Personality Questionnaire in Employees: A Personality Profile Distribution

Background: The people with morningness orientation wake up early morning, and people with eveningness orientation wake up with difficulty. Objectives: The purpose of this study was to investigate the content and convergent validity of the Persian Morningness- Eveningness Personality Questionnaire in employees and a personality profile distribution. Methods: The current study is a descriptive type of survey, which 200 employees of Shahid Chamran University Ahvaz were randomly selected among the population of Shahid Chamran University employees. They completed the Morningness-Eveningness Personality Questionnaire, and Late/Early Sleep Preferences Scale. Results: The content validity ratio indicated that the total of experts agreed on that there was an association between the items and domain of 0.54 to +1. The Cronbach’s alpha coefficient was 0.82 for the entire questionnaire. The coefficients of each item with the total score of MEPQ ranged from 0.25 to 0.57. The convergent validity coefficient for this questionnaire with Late/Early Sleep Preferences Scale was significant (P < 0.001). The personality profile revealed that about 143 (71.5%) of the 200 participants fell into the intermediate category. Conclusions: Given the validity and reliability of the Morningness-Eveningness Personality Questionnaire, this questionnaire can be used in professional, industrial, and occupational environments to assign people to specialized and non-specialized jobs.