Introduction：Occupational therapy seeks to facilitate the clients’ functional performance through motivated, meaningful participation in life occupations. Clients with depressive disorder commonly experience reduction in motivation and energy. Poor motivation can be an impediment to their adaptive functioning. Hence, Data collected on a person’s motivation enables the therapists to identify motivational barriers to functioning and to plan appropriate intervention. Volition refers to the motivation for occupation.
The Volitional Questionnaire can provide individualized and concrete information about the person’s specific motivational characteristics (e.g., personal causation, values, and interests), and identify environmental factors that support or hinder the person’s volition. The purpose of this thesis is to validate the psychometric properties of the Chinese version of the Volitional Questionnaire for clients with depressive disorders in Taiwan.
Methods：The Volitional Questionnaire was translated into Mandarin via 2 stage methodology and tested on 97 clients who were diagnosed with depressive disorders and were recruited from one university-affiliated hospital and two psychiatry rehabilitation hospitals in northern Taiwan. The clients were consisted of twenty-three males and seventy-four females. The average age of the clients was 47.14 years old. (SD=14.12). All subjects participated in purposeful activities that were arranged by the researcher or choose by self, then, the volitional status of the clients was assessed by the researcher. Furthermore, the clients had to finish 5 assessments tools in order to examine the psychometric properties of the Chinese version of the Volitional Questionnaire. The data was analyzed by using Rasch measurement model and traditional test theory.
Results：Rasch analysis indicated that the Volitional Questionnaire-Chinese version encompasses a unidimensional construct. The results of the study showed that test-retest reliability of the Volitional Questionnaire-Chinese version, ICC= .82. Kappa value of individual item of the Volitional Questionnaire-Chinese version was between .449 and .876. The item separation coefficient is 1.00 showed that the Volitional Questionnaire-Chinese version had ideal internal consistency reliability. Lower correlations between the VQ-C and the criterion-related assessment tools revealed that the concurrent validity of the VQ-C was within acceptable level. Furthermore, The 49 clients took part in two different activities with different occupational forms of environment that indicated significant difference in volitional performance (t = 8.670 ，p =.000). This result did meet the theory of the「Model of Human Occupation」. That is, the volitional function of the clients could be influenced by environmental features.
Conclusions：This study confirmed that the VQ-C is a reliable and effective assessment tools, which can provide useful information to therapists about the client’s volitional performance as references in clinical evaluation, intervention program, progression of treatment, or academic research.
Refrences:
Yang, M. S. (2007). Psychometric Study of Chinese Version of the Volitional Questionnaire for Clients with Depressive Disorders in Taiwan. Unpublished master’s thesis, National Taiwan University, Taipei.
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