Based on NANDA diagnosis recommendations, entertainment-sector workers were asked to record their perceptions and the meaning of their substance-use problem in a diary. The intervention was subsequently designed based on brief motivational psychoeducational therapy (BMPT).

The brief motivational psychoeducational therapy (BMPT) it lasted an average of 90 min and followed the following structure: (i) brainstorming the concepts of health, lifestyle, and substance-use prevention; (ii) analysis of a work accident at an international rock group concert, which was used to generate (iii), a debate on consumer habits (30 min); (iv) discussion of the substance types and classifications known by the participants; (v) Prochaska and DiClemente's stages of change and (vi), the consequences of drug use (50 min); and finally, (vii) a true/false quiz used to discuss myths and beliefs about drugs (10 min).

Health related quality of life (HRQL) meassured by EQ-5D (EuroQuol) The EQ-5D-3L descriptive system comprises the following 5 dimensions, each describing a different aspect of health: mobility, self-care, usual activities, pain/disconfort and anxiety/depression. Each dimension has 3 respnse levels of severity: no problems, some problems, extreme problems. The respondent is asked to indicate his/her health state by checking the box next to the most appropiate response level of each five dimensions.

Assessment of the Quality of Life in Psychoactive Substance Addicts Test TECVAS

It consists of 22 items (18 positive and 4 negative [items 15, 19, 20 and 21]) with a graded response format of five alternatives. The response alternatives are coded with the following alternatives: a) in the positive items: nothing (5 points), little (4 points), sometimes (3 points), enough (2 points) and much (1 point); b) in the negative items: nothing (1 point), little (2 points), sometimes (3 points), enough (4 points) and much (5 points). Therefore, in each element, a higher score represents a more positive evaluation of the content, and in the test, a higher score represents a better HRQL.

Stages of Change Readiness and Treatment Eagerness Scale (SOCRATES Scale) SOCRATES is an experimental instrument designed to assess readiness for change in alcohol and drugs abusers. The instrument yields three factorially-derived scale scores: Recognition (Re), Ambivalence (Am), and Taking Steps (Ts). It is a public domain instrument and may be used without special permission. The statements describes a way that the user might (or might not) feel about his/her drug use. For each statement, he/she has to circle one number from 1 to 5, to indicate how much they agree or disagree with it right now.