The blue lines represent 95% confidence intervals of the effect size estimates. The blue rectangles are proportional to the square-root of the sample size. The blue diamonds represent the meta-analysis estimate of AAs and EAs. Abbreviations: Cannabis related aggression (CRA), cannabis dependence (CaD), alcohol dependence (AD), cocaine dependence (CocD), opioid dependence (OD), antisocial personality disorder (ASPD), conduct disorder (CD), alcohol-related aggression (ARA), cocaine-related aggression (CocRA), opioid-related aggression (ORA).