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. 2022 Jan 27;15:797473. doi: 10.3389/fnbeh.2021.797473

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Copyright © 2022 Steinhoff, Bechtiger, Ribeaud, Eisner, Quednow and Shanahan.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Prevalence of counts of substances (based on extended questionnaire and excluding alcohol and tobacco) used during the previous year at age 20. Note. Categories nine and higher were combined due to low prevalence.