Study groups in module 1 | Name | Past 12 months prevalence | ≥10 consumption days within past 12 months | ≥10 consumption days within 1 year (at any time except past 12 months) | Currently ATS dependent | Formerly ATS dependent |
Group 1 | Currently dependent users | Yes | Yes | n.a. | Yes | n.a. |
Group 2 | Formerly dependent users | n.a. | n.a. | Yes | No | Yes |
Group 3 | Currently frequent, non-dependent users | Yes | Yes | n.a. | No | No |
Group 4 | Formerly frequent, non-dependent users | No | n.a. | Yes | No | No |
Group 5 | Non-frequent users (currently or formerly) | No | n.a. | No | No | No |
Group 6 | Exposed non-users | n.a. | n.a. | n.a. | n.a. | n.a. |
Module 2: Survey questionnaire.
ATS, amphetamine-type stimulant.