Becoña 2017.

Study characteristics
Methods	Study design: secondary analysis of RCT Country: Spain Data collection period: January 2016 – April 2018 Registry ID: ClinicalTrials.gov: NCT02844595
Participants	Number of participants: N = 275; Number included in meta‐analysis: N = 127 Sample characteristics (at baseline): Age (mean): SCBSCT‐BA 45.2 years (SD 11.2), SCBSCT 44.6 years (SD 10.7), WL 47.1 years (SD 10.6); Sex (% male): SCBSCT‐BA 39.1% (43/110), SCBSCT 36.7% (40/109), WL 41.1% (23/56) Population category: general population; Specific population: adults who smoke Nicotine dependence: Fagerström Test for Cigarette Dependence SCBSCT‐BA 4.6 (SD 2.1), SCBSCT 5.0 (SD 2.2), WL 4.9 (SD 2.1); Baseline cigarettes per day: SCBSCT‐BA 18.9 (SD 7.3), SCBSCT 19.3 (SD 7.4), WL 19.0 (SD 7.2); Motivation to quit: selected by motivation to quit
Interventions	Behavioural support for smoking cessation: cognitive behavioural smoking cessation treatment with components of behavioural activation (SCBSCT‐BA), standard cognitive‐behavioral treatment for smoking cessation (SCBSCT) and wait‐list control group (WL) Pharmacological support for smoking cessation: no pharmacological support Psychotherapeutic or psychoactive support for mental health or mood: received mood management ‐ SCBSCT‐BA included analysis of the relationship between behaviour and mood, identification of situations and behaviours that worsen mood, identification of avoidance behaviours and rumination, self‐report of pleasant daily activities, and pleasant activity scheduling to increase engagement in non‐smoking‐related rewarding activities
Outcomes	Definition of cessation used: 7‐day point‐prevalence abstinence Cessation definition used for outcome(s) in this analysis: point‐prevalence abstinence Measure of biovalidation: expired CO reading of ≤ 9 ppm Definition of people who continued to smoke used: self‐reported smoking; self‐reported abstinence but carbon monoxide ≥ 10 ppm Time point(s) at which follow‐up was conducted: end of treatment, 3‐, 6‐ and 12‐month follow‐ups Outcome category: Depression Outcome measure(s): Beck Depression Inventory II (BDI‐II)
Funding source	Supported by the Spanish Ministry of Economy and Competiveness (Project reference: PSI2015‐66755‐R) and co‐financed by FEDER (European Regional Development Fund; pluri‐annual plan 2014‐2020)
Author conflicts of interest	Authors declared that no competing interests exist
Notes	Outcome data source: Published and unpublished data