Introduction: This study presents the development and validation of the Inventory of Outcome Expectancy in Marijuana Users (Inventário de Expectativas de Resultados em Usuários de Maconha, IERUM), which evaluates the outcome expectancy regarding marijuana use, and may be useful in the treatment and prognosis of marijuana-dependent individuals. Method: The sample comprised 181 male (n = 145) and female (n = 36) marijuana users. Their age ranged from 18 to 55 years old (28.34±8.57). One hundred and eighteen patients were hospitalized at a chemical dependency unit, 23 were being treated in an outpatient clinic, 25 were receiving treatment in a self-help group (drug addicts anonymous, alcoholic anonymous), and 15 were not being treated. The 17-item scale was developed based on the experience related to chemical dependency and scale validation, with the semantic validation being the first phase of the process. Results: According to the factor analysis, the IERUM was divided into five factors (emotional aspects, perception, craving, cognitive aspects, and sexual aspects) that accounted for 60.18% of the variance. Conclusion: The IERUM showed good psychometric properties and can be used to evaluate the outcome expectancy related to marijuana use.
Cannabis; expectancy; IERUM; development; validation
