The rise of underage gambling in the UK This allowed the included studies, both controlled intervention studies and single-arm studies, to be evaluated for risk of bias. A systematic review of quantitative studies, including randomized controlled trials (RCTs) and quasi-experimental studies, was conducted. This systematic review was implemented in accordance with the standards of Preferred Reporting Items for Systematic Reviews and Meta-analysis (PRISMA) guidelines 31,32. We also know that when…