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Supplemental Information

Respondent characteristics

Table S1 shows respondent characteristics, means, standard deviations for different measurements, independent t-test, results between gender and between drug-user high-school students versus non-drug user, total sum of scores for the variables, the numbers of included items as well as the Cronbach’s alpha.

DOI: 10.7287/peerj.preprints.254v1/supp-1

Additional Information

Competing Interests

The authors declare that there are no competing interests.

Author Contributions

Fariba Mousavi conceived and designed the experiments, performed the experiments, analyzed the data, contributed reagents/materials/analysis tools, wrote the paper, prepared figures and/or tables, reviewed drafts of the paper.

Danilo Garcia analyzed the data, wrote the paper, prepared figures and/or tables, reviewed drafts of the paper.

Trevor Archer wrote the paper, reviewed drafts of the paper.

Béatrice M Ewalds-Kvist analyzed the data, wrote the paper, prepared figures and/or tables, reviewed drafts of the paper.

Funding

This research was supported by the Stiftelsens Kempe-Carlgrenska Fonden. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.


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