Foroushani 2019.

Study characteristics
Methods	Study design: randomized controlled trial Study grouping: parallel group
Participants	Substance: opioids Baseline characteristics Mindfulness‐based intervention Number randomized: 30 Control 1 Number randomized: 30 Overall Number randomized: 60 Included criteria: male, receiving methadone maintenance therapy, three lapses during MMT Excluded criteria: absence from 2+ sessions for experimental group Number missing: 5 Reason missing: not reported Baseline differences: unclear age: 35.5 Race/Ethnicity: Iranian
Interventions	Intervention characteristics Mindfulness‐based intervention Group name: MBRP Theory: Bowen et al. (2011) Duration: 8 weeks Timing: 1x week for 2 hours. Delivery: group Providers: not reported Co‐intervention: methadone maintenance treatment Integrity: not reported Compliance: not reported Control 1: No treatment control Co‐intervention: methadone maintenance treatment
Outcomes	Treatment acceptability (attrition) Outcome type: dichotomous outcome Reporting: fully reported Direction: lower is better Data value: endpoint Time point: post‐treatment
Identification	Sponsorship source: internal funds Country: Iran Setting: not residential Authors name: Nahid Sarami Foroushani Institution: Islamic Azad University Email: nahid.sarami97@gmail.com Address: Department of Psychology, Khomeinishar Branch, Islamic Azad University, 581796781, Isfahan, Iran COI: none Diagnosis tool: receiving methadone maintenance therapy at addiction treatment center Diagnosis type: informal Funding: internal funds Journal: Heroin Addiction & Related Clinical Problems Publication type: published report Secondary publications:
Notes
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	Judgement comment: not reported
Allocation concealment (selection bias)	Unclear risk	Judgement comment: not reported
Blinding of participants and personnel (performance bias) All outcomes	High risk	Judgement comment: no blinding
Blinding of outcome assessment (detection bias) Treatment acceptability (attrition)	Low risk	Objective measure
Incomplete outcome data (attrition bias) All outcomes	High risk	Judgement comment: dropout only in the treatment group, did not use ITT
Selective reporting (reporting bias)	Unclear risk	Judgement comment: no protocol available, no statement of primary outcome
Other bias: equivalence of baseline characteristics (selection bias)	Unclear risk	Judgement comment: not reported