DRUG USE DECISIONAL BALANCE SCALE (DUDBS): PSYCHOMETRIC PROPERTIES OF THE IRANIAN VERSION

Background and Aim : The transtheoretical model (TTM) is an effective model for studying the cessation of drug use. Various questionnaires have been developed based on the TTM for evaluating to what extent interventional programs can make modifications in behavior. The purpose of the present study is to describe the psychometric properties of the Iranian version of the Drug Use Decisional Balance Scale (DUDBS).Methods : The forward-backward approach was applied to translate the DUDBS from English into Persian. A cross-sectional study was done, and psychometric properties of the Iranian version of the DUDBS were measured. Using a cluster sampling method, 400 male drug users aged 20 years or older were employed from ten addiction treatment clinics in Zanjan, Iran. To measure the reliability of the DUDBS, internal consistency and test-retest methods were used. Face and content validity were measured, and the construct validity of the DUDBS was assessed by applying both exploratory factor analysis (EFA) and confirmatory factor analysis (CFA). Data were analyzed using SPSS and AMOS.Results : The results of EFA indicated a two-factor solution for the DUDBS that accounted for 63.76% of observed variance. The results obtained from the CFA demonstrated that the data fit the model: the relative chi-square (x2/df) was equal to 1.98 (p < .001), and the root mean square error of approximation (RMSEA) was equal to .07 (90% CI = .05 - .08). All comparative indices of the model counting GFI, AGFI, CFI, NNFI, and NFI were more than .90 (1.00, 1.00, 1.00, 1.00, and .99, respectively). The Cronbach’s alpha ranged from .89 to .91, proving a satisfactory reliability. Additionally, the intraclass correlation coefficient (ICC) ranged from .94 to .98, proving an acceptable result. Conclusion : The results from this study show that the Iranian version of the DUDBS has good psychometric properties and is appropriate for assessing substance abuse behaviors among Iranian addicted persons.

کلیدواژه ها:

Drug Use ، Decisional Balance Scale ، Reliability ، Validity.