RESUMO
Aim: The aim of this study was to evaluate the psychometric properties of a Swedish version of the Impaired Control Scale. Impaired control (IC) over alcohol consumption is a core symptom of alcohol use disorder and a predictor of treatment outcome, but measures of IC are not well utilised in clinical practice. Methods: The study comprised 250 individuals from a randomised controlled trial conducted at an adult outpatient addiction clinic in Sweden. The statistical analyses concern dimensionality, convergent and divergent validity, reliability, measurement invariance and sensitivity to change. Results: Regarding dimensionality, a principal component analysis of the standardised residuals from a Rasch model indicated some evidence of further dimensions underlying the responses in the Failed Control (FC) and Perceived Control (PC) parts. Two parallel items (12 and 22 respectively) seemed to drive potential multidimensionality. When these items were excluded, goodness of fit to one-dimensional models was improved. Tests of convergent and divergent validity showed that failed control had the strongest associations to impaired control and alcohol use disorder while the attempted control part was not associated with the construct of impaired control or alcohol use disorder. Conclusion: The present results show that the FC part is the most valid measure of the underlying construct of IC. In addition, FC had close to a large effect in regard to sensitivity to change. This suggests that the FC part has potential utility for use as an assessment and evaluation tool of treatment effect on impaired control of drinking.
RESUMO
OBJECTIVE: The aim of this study was to examine the reliability and validity of the Korean version of the Impaired Control Scale (K-ICS), a scale to screen patients with alcohol use disorder. METHODS: Participants were 173 inpatients with alcohol use disorder (AUD), and 174 normal controls (NC). Both AUD and NC groups completed the K-ICS as well as the Alcohol Dependence Scale (ADS), the Alcohol Abstinence Self-Efficacy Scale (AASES), the Brief Self-Control Scale (BSCS), and the Hospital Anxiety and Depression Scale (HAD). RESULTS: The internal consistencies of K-ICS were good in both AUD and NC. A good convergent validity was clearly shown by significant correlations with the ADS and the AASES, respectively. But the K-ICS had no or weak correlations with the BSCS and the HAD. The ROC curve analyses indicated that the optimal cut-off points of failed control (FC) and predicted control (PC) were estimated as >15 and >13, respectively. Hierarchical multiple regression analysis suggested that FC is a robust predictor of the severity of AUD. CONCLUSION: The K-ICS, especially FC subscale of it appears to be a valid and reliable measure of impaired control among both clinical and non-clinical sample.
RESUMO
OBJECTIVE: The aim of this study was to examine the reliability and validity of the Korean version of the Impaired Control Scale (K-ICS), a scale to screen patients with alcohol use disorder. METHODS: Participants were 173 inpatients with alcohol use disorder (AUD), and 174 normal controls (NC). Both AUD and NC groups completed the K-ICS as well as the Alcohol Dependence Scale (ADS), the Alcohol Abstinence Self-Efficacy Scale (AASES), the Brief Self-Control Scale (BSCS), and the Hospital Anxiety and Depression Scale (HAD). RESULTS: The internal consistencies of K-ICS were good in both AUD and NC. A good convergent validity was clearly shown by significant correlations with the ADS and the AASES, respectively. But the K-ICS had no or weak correlations with the BSCS and the HAD. The ROC curve analyses indicated that the optimal cut-off points of failed control (FC) and predicted control (PC) were estimated as >15 and >13, respectively. Hierarchical multiple regression analysis suggested that FC is a robust predictor of the severity of AUD. CONCLUSION: The K-ICS, especially FC subscale of it appears to be a valid and reliable measure of impaired control among both clinical and non-clinical sample.
