Zhang 2019.

Study characteristics
Methods	Study design: randomized controlled trial Study grouping: parallel group
Participants	Baseline characteristics Mindfulness‐based intervention Number randomized: 20 Control 1 Number randomized: 20 Overall Number randomized: 40 Included criteria: DSM‐5 stimulant use disorder, receiving treatment at mandated drug rehabilitation center Excluded criteria: cognitive disability, serious physical health condition, previous mindfulness‐related practice experience (e.g., qigong), had participated in previous study, participating in concurrent study Number missing: not reported Reason missing: not reported Baseline differences: intervention group younger age, no differences in drug use history or other demongraphics Age: 34.4 Percent female: 0% Race/Ethnicity: 100% Chinese
Interventions	Intervention characteristics Mindfulness‐based intervention Group name: MBRP Theory: Bowen et al. (2009) Duration: 10 days Timing: 1x day for 2 hours Delivery: group Providers: not reported Co‐intervention: residential treatment‐as‐usual Integrity: not reported Compliance: not reported Control 1: no treatment control Co‐intervention: residential treatment‐as‐usual
Outcomes	No eligible outcomes reported
Identification	Sponsorship source: n/a Country: China Setting: residential Authors name: Zhang Institution: Shanghai Jiao Tong University Email: dujiangdou@163.com Address: Shanghai Mental Health Center, Shanghai Jiao Tong University School of Medicine, Shanghai 20030, China COI: not reported Diagnosis tool: DSM‐5 Diagnosis type: formal Funding: none reported Journal: National Natural Science Foundation of China, Project of Science and Technology Commission of Shanghai Municipality Publication type: published report Secondary publications: none Substance: stimulants
Notes
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Low risk	Randomized number table
Allocation concealment (selection bias)	Unclear risk	Not reported
Blinding of participants and personnel (performance bias) All outcomes	High risk	No blinding
Incomplete outcome data (attrition bias) All outcomes	Unclear risk	Dropout not reported
Selective reporting (reporting bias)	High risk	Protocol available and not all outcomes reported
Other bias: equivalence of baseline characteristics (selection bias)	Low risk	Treatment‐as‐usual control

CBT: cognitive behavioral therapy;COI: conflict of interestDSM‐5: Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition; ITT: intention‐to‐treat; MBI: mindfulness‐based interventions; MBRP: mindfulness‐based relapse prevention; MBSR; mindfulness‐based stress reduction; PTSD: post‐traumatic stress disorder; SCID: structured interview guide;SD: standard deviation; SUD: substance use disorderTAU: treatment as usual.