Methods: Quasi-experimental design, with an intervention group. Population: 64 first-year students of a public high school in Coatzacoalcos, Veracruz, Mexico. Sample: 16 students. Sampling: Non-probabilistic sampling for convenience due to criteria for intervention. Instruments: Alcohol Use Disorders Identification Test (AUDIT) (OMS, 1989) and Self-concept Tennessee Scale (Fitts, 1965). The research was in two stages, "Detection of cases and Admission" and "Intervention". The implementation of the intervention was in 8 sessions during May-June of 2018. It was used the perspective of the Callista Roy Adaptation Model (MAR), with the central concept of the Self-concept Adaptive Mode.
Results: Comparing the self-concept adaptive mode and alcohol consumption before and after intervention, no significant differences were found in pre and post-intervention self-concept (Z=-129, p=0.897), unlike alcohol consumption that showed significant differences before and after intervention (Z=-3.524, p=0.0001). Before the study, the adolescents were distributed among the four patterns of AUDIT, 56.3% with low risk, 31.3% at risk and 6.3% for both patterns of harmful and dependent. At the end of the intervention, 87.5% reported a low risk alcohol consumption pattern and a 12.5% risk. A negative and significant relationship was found between social self-concept and post-intervention alcohol consumption (r=-0. 540*, p=0.031), as well as a negative and significant relationship between general self-concept and post-intervention alcohol consumption (r=-0. 544 *, p=0.029). The magnitude of the effect of intervention for alcohol consumption was substantial (d=1139) according to the Cohen criteria.
Conclusion: The self-concept adaptive mode was related to alcohol consumption after the intervention in the population, it is possible that the sessions reflected about the consumption and beliefs of oneself, although the intervention may not be enough to improve the self-concept, contributed to the decrease of alcohol consumption.