Introduction: In Mexico, marijuana consumption has increased in adults and university students, triggering problems in attention, concentration, anxiety, depression, dependence, and cardio-respiratory difficulties. Psychological interventions like brief motivational treatment (BMT) and cognitive behavioral therapy (CBT) have reported some difficulties such as a low and medium effect size, decreased consumption without reaching abstinence, and heterogeneity in the use of both cognitive and behavioral techniques. The use of behavioral techniques in Behavioral Activation has reported effectiveness in the treatment of anxiety, depression, and recently in alcohol and tobacco. Objective: to evaluate the effect size of a Behavioral Activation treatment in abstinence of marijuana (BA-M) measured in units, occasions, and quantity of consumption. Method: in a sample of university students (n = 8), the intervention of behavioral activation was applied, which includes functional analysis, planning and goal setting, contingency management, skills training, and relapse prevention. It was carried out a multielement single case design with eight replications, calculating the effect size through the non-overlapping index of all pairs. Results: high effect size was obtained in the consumption pattern, ranging between 91.10% and 100%, 5 university students achieved abstinence. Discussion and conclusions: treatment in BA-M obtained a high effect size in abstinence and a decrease in marijuana abuse these results are similar to those reported in alcohol and tobacco.
Introducción: antes de empezar el tratamiento, es necesario conocer el patrón de consumo, determinar los antecedentes y las situaciones de riesgo que llevan al individuo a consumir en exceso, entre otras variables. Hasta el momento no se cuenta con un instrumento validado en México que mida las situaciones que precipitan el consumo de alcohol. Objetivo: validar el Inventario situacional de consumo de alcohol (ISCA) en población mexicana consumidora de esta sustancia. Método: se obtuvo una muestra de 592 (88.2% hombres, 11.8% mujeres), cuyas edades oscilaron entre los 18 y los 30 años de edad (M = 21.13, S.D. = 2.26), que solicitaron atención psicológica por problemas con su consumo de alcohol, de los cuales 66.2% reportó dependencia baja y 33.8%, dependencia moderada. Resultados: se realizó un análisis confirmatorio de máxima verosimilitud robusta, con el que se obtuvo un instrumento confiable (α = .96) y válido, con una varianza explicada del 59%. Discusión y conclusión: se obtuvo un instrumento válido, confiable y breve aplicable en intervenciones breves para usuarios que buscan tratamiento para consumo de alcohol.
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