Primary outcomes
HEART
Our primary outcomes included drug craving, mental wellbeing, sleep quality, heart rate (HR), systolic blood pressure (SBP), diastolic blood pressure (DBP), and mean arterial pressure (MAP). These outcomes were measured at 9 a.m. every Saturday (fasting state) in the detention center’s classrooms.Drug craving: A Visual Analog Scale (VAS) scale was employed for self-reports, which is a common tool for measuring drug craving levels (Mental wellbeing: The WHO-5 wellbeing index (Sleep quality: The Pittsburgh Sleep Quality Index (PSQI) was employed to indicate sleep quality (HR/SBP/DBP/MAP: Heart rate and blood pressure were measured by portable monitors (instrument model: OMRON U10L).All the self-reported scales were obtained under a timeframe of “the past week.”