The distribution of QMU scores and negative mood states in the participants following the different durations of abstinence. QMU, Questionnaire of METH-use Urge. Factor 1 addresses “intention/desire to use meth” and factor 2 addresses “anticipation of relief of negative effect/urgent desire to use meth”. TMD: Total Mood Disturbance. *: QMU total scores were higher in subjects who were abstinent for 4–9 months and 10–15 months, compared to those are abstinent for 1–3 months (Kruskal Wallis tests, p<0.05).