Psychometric Evaluation of the Addiction Self-Efficacy Scale.

: To psychometrically evaluate a new investigator-developed 14-item Addiction Self-Efficacy Scale (ASES). : One hundred seventy-one subjects (114 male and 57 female) were recruited from an in-house rehabilitation program. Subjects were given the 14-item ASES between days 25 and 30 of the treatment program. : The item means ranged from 7.19 to 9.34. There was a ceiling effect on all 14 items. The ASES was found to be multidimensional with two factors accounting for 64% of the total variance explained. Reliability of subscale 1 with nine items was .92 whereas, subscale 2 with five items had a reliability of .86. : The ASES has evidence of reliability, face validity, and content validity.