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Table 1 Operationalisation of the study groups

From: Using life course charts to assess and compare trajectories of amphetamine type stimulant consumption in different user groups: a cross-sectional study

Group 1: currently ATS dependent (CDU)Group 2: formerly ATS dependent users (FDU)Group 3: currently frequent, non-dependent ATS users (CFU)Group 4: formerly frequent, non-ATS dependent users (FFU)Group 5: non-frequent ATS users (currently and formerly) (NFU)Group 6: exposed non-ATS users (ENU)
SDS positive (last 12 months)SDS positive (any time except last 12 months)SDS negative lifetimeSDS negative lifetimeSDS negative lifetimeSDS not applicable
≥ 10 ATS consumption days within past 12 months≥ 10 ATS consumption days within a year except past 12 months≥ 10 ATS consumption days within past 12 months≥ 10 ATS consumption days within a year except past 12 months< 10 ATS consumption days within any given 12 monthsExposed to ATS without ATS consumption