Psychometric properties of the positive mental health questionnaire: short form (PMHQ-SF18) in young adults

Introduction Positive Mental Health (PMH) plays a pivotal role in the promoting of mental health. Assessing this phenomenon is essential for early recognition and intervention in mental health. To date, only one tool was validated with 39 items to assess PMH among Portuguese young adults. Method This study sought to examine the psychometric properties of the short version of the Positive Mental Health Questionnaire (PMHQ) among Portuguese university students. The PMHQ Short Form was administered to a sample of 3,647 university students via an online platform. Exploratory and confirmatory factor analyses were performed. The principal factor solution was employed because some items showed higher levels of kurtosis. Multivariate analysis was tested using the Mardia’s Test, Henze-Zirkler, and Royston. Findings of content, construct validity tests, and Cronbach’s alfa demonstrated the satisfactory validity and suitable reliability of the PMHQ-Short Form (PMHQ-SF). Results and discussion The exploratory factor analysis produced six dimensions of the PMHQ-SF with three items in each factor demonstrating adequate internal reliability. The global internal consistency was 0.92, with factors ranging between 0.60 to 0.82. The results suggest that the PMHQ-SF is reliable, easier, and more practical to complete by university students due to the shortening of the number of items. The PMHQ-SF is useful for assessing positive mental health in young adults. The final version of the instrument contains from 32 to 18 items.