Psychometric properties of the Iranian version of the Mastery Motivation Questionnaire (DMO18) in children 6-23 months

Introduction: motivation is an inner psychological driving force that persuades child to take efforts to master activities or skills that are somewhat challenging, The aim of this study was to investigate the psychometric properties of the Iranian version of the Mastery  Motivation Questionnaire(DMQ18) in children aged 6-23 months. Method: this research is a descriptive – survey method, which in 1047 children aged 6 to 23 months, recruited randomly from shiraz that rating by the parent in mastery motivational Dimensions of Mastery Questionnaire (DMQ-18). it has 39 items, with seven subscales in the 5 Likert range were used to quantify it. Psychometric of Questionnaire used by content validity (expert opinions) and construct validity by confirmatory factor analysis; and reliability was evaluated through Cronbach’s alpha. KMO index for sampling adequacy and Bartlett test for sphericity of the studied questionnaire data are in good condition, Kaiser-Meyer-Ulkin index (KMO) is equal to 0.89, and Bartlett index is significant at the level of 0.001. Result: The results of confirmatory factor analysis show that the questionnaire has good validity and fit and 7 subscales of mastery motivation have the desired factor loads (0.75-0.99), Non-questions excluded from the confirmatory factor analysis, and thus all questions remained. Also, Cronbach's alpha coefficient is 0.95, which indicates that the mastery motivation questionnaire has acceptable reliability. Internal consistency was acceptable in all subscales (more than 0.70) except for the negative reaction (0.60). ) and general competence (0.63).  Conclusion: MQ18 (parental report) was valid and reliable for children 6-23-month-olds, it has robust psychometric properties also specialist and psychologists of child development has scientific and practical uses.