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Abstract
A 21-item measure of gambling abstinence self-efficacy (GASS) was developed. A principal component analysis of 101 pathological gamblers supported the use of a total score that showed good internal (α=.93) and retest reliability (ICC (n=35)=.86) as well as four subscales: 1) winning/external situations (6 items, α=.91); 2) negative emotions (9 items, α=.87); 3) positive mood/testing/urges (3 items, α=.70); 4) social factors (3 items, α=.81). The total and subscales showed moderate relationships with single item ratings of confidence to abstain from gambling and weak or non-significance relationships with demographic and gambling-related variables. The total score and three of the subscales showed evidence of predictive validity for gamblers not currently involved with treatment. Higher self-efficacy was related to fewer days of gambling over a 12-month period. These results provide preliminary support for the reliability and validity of the GASS.