Table 1

Operationalisation of study groups in module 1

Study groups in module 1NamePast 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 dependentFormerly ATS dependent
Group 1Currently dependent usersYesYesn.a.Yesn.a.
Group 2Formerly dependent usersn.a.n.a.YesNoYes
Group 3Currently frequent, non-dependent usersYesYesn.a.NoNo
Group 4Formerly frequent, non-dependent usersNon.a.YesNoNo
Group 5Non-frequent users (currently or formerly)Non.a.NoNoNo
Group 6Exposed non-usersn.a.n.a.n.a.n.a.n.a.
  • Module 2: Survey questionnaire.

  • ATS, amphetamine-type stimulant.