Background: The psychosocial functioning and motivation scales of the Texas Cristian
University (TCU) were translated and validated for the Persons Who Use Drugs (PWUDs).
Methods: This study was carried out as a methodological research. The scales were translated forward
and backward and then, the PWUDs in Kermanshah-based (west of Iran) substance abuse
treatment centers in 2019 filled out the scales. Participants included 250 individuals who were selected
by convenience sampling method. A demographics form and psychosocial functioning and
motivation scales were used to collect data. For data analysis, content validity, face validity, testretest,
internal consistency, and construct validity were applied by using exploratory analysis methods
in SPSS (v.20) and confirmatory factor analysis in LISREL software.
Results: Exploratory Factor Analysis (EFA) results were obtained by using the main component
analysis and Varimax rotation of three factors (psychological function, social function, treatment
motivation). Extracted factors, along with the eigenvalues, attributed variance percentage, and cumulative
attributed variances by each factor, by 68.56%, showed a total variance of the questionnaire.
Moreover, the fitness indexes of the Confirmatory Factor Analysis (CFA) of psychological
function, social function, and treatment motivation were 0.059, 0.075 and 0.072, respectively.
Therefore, the questionnaire fitness was at an acceptable level. The test-retest reliability coefficient
was 0.875, and the Cronbach's alpha coefficient for all the components was higher than 0.71.
Conclusion: The results showed that psychosocial functioning, motivation scales have good psychometric
properties, and they can be used in research and treatment fields.