Fig. 2

Mean ratings of the consequences of GHB use (the impact on the physical and mental health of the user, on its social environment, and on party settings) differentiated by user groups. Note User groups were clustered in no current use (“no lifetime use “ or “use > 12 months ago “), occasional use (“ < 1 × per month” and “1–3 × per month”), and heavy use (“1–2 × per week”, “3–5 × per week”, and “(almost) daily”). The rating scale for the consequences ranged from −2 to 2 (−2 = “negative”; -1 = “rather negative”; 0 = “neutral”; 1 = “rather positive”; 2 = “positive”)