A total of 1264 students participated in the preventive programme; 54 students were excluded from the analysed sample due to incomplete/incorrect filling of the questionnaires (e.g., ticking multiple options in single-choice questions or using ambiguous indicators). The questionnaire was also excluded from analysis if the pair (input and output part of the questionnaire) was incomplete. The final sample consists of 1210 students.

Data about sex, age (age groups 13–14 years, 15–16 years, 17 and older) and the type of school—a grammar school (GS), a secondary school (SS), or a lower secondary school (LSS)—were collected. Test questions were awarded one point for each correct answer. The maximum was 22 points. The total score was expressed as a percentage of the maximum. The two questions that were changed over the course of data collection (questions 8, 9—Appendix A) were excluded from the total score. The total score was calculated separately for the input and output questionnaire. Students’ evaluation of the programme quality was on a scale from 1 (the best) to 5 (the worst).

EpiData Software was used for the electronisation of the data from paper questionnaires.

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