Very little data exists for rates of substance use disorder among people with SPD, but existing studies suggest they are less likely to have substance abuse problems than the general population. One study found that significantly fewer boys with SPD had alcohol problems than a control group of non-schizoids. Another study evaluating personality disorder profiles in substance abusers found that substance abusers who showed schizoid symptoms were more likely to abuse one substance rather than many, in contrast to other personality disorders such as borderline, antisocial or histrionic, which were more likely to abuse many.