Lee 2019.

Study characteristics
Methods	Study design: secondary analysis of RCT Country: South Korea Data collection period: September 2013 – February 2019 Registry ID: ClinicalTrials.gov: NCT02916628
Participants	Number of participants: N = 163; Number included in meta‐analysis: N = 54 Sample characteristics (at baseline): Age (mean): people who quit 26.9 years (SD 5.2), people who continued smoking 27.2 years (SD 5.5); Sex (% male): people who quit 100% (15/15), people who continued to smoke 95.3% (141/148) Population category: general population; Specific population: participants in a RCT of smoking cessation Nicotine dependence: not measured; Baseline cigarettes per day: people who quit 9.7 (SD 4.9), people who continued to smoke 13.5 (SD 6.6); Motivation to quit: selected by motivation to quit
Interventions	Behavioural support for smoking cessation: the smoking cessation intervention consisted of 6 sessions of motivational interviewing, positive group psychotherapy, and auricular acupressure ‐ total intervention time was 6 hours (1 hour per week for 6 weeks) Pharmacological support for smoking cessation: no pharmacological support Psychotherapeutic or psychoactive support for mental health or mood: participants received positive group psychotherapy, but there is no clear evidence that this is effective for treatment of low mood or other mood‐related symptoms
Outcomes	Definition of cessation used: ‘abstainers’, exact definition not reported in paper; NCT record states self‐reported 7‐day point‐prevalence abstinence (where abstinence reported) would be bioverified Cessation definition used for outcome(s) in this analysis: point‐prevalence abstinence Measure of biovalidation: not reported in paper; NCT record states urine cotinine and serum cotinine ( ≤ 10 ng/ml) Definition of people who continued to smoke used: ‘smokers’, exact definition not reported; ‘failed to maintain smoking cessation’ Time point(s) at which follow‐up was conducted: 6 weeks, 6 months, 1 year, and 2 years after the smoking cessation intervention Outcome category: Depression Outcome measure(s): Patient Health Questionnaire (PHQ‐9)
Funding source	None specified
Author conflicts of interest	Dr. Lee has received research grants from the National Research Foundation of Korea (NRF) (2014002505)
Notes	Outcome data source: Published data