Silbernagl M, et al. - Researchers investigated patterns of psychiatric comorbidity in patients with opioid use disorder enrolled in opioid maintenance treatment (OMT) and patients undergoing treatment for problem gambling (PrG; n = 80; M age = 43.1 years; 20% female). Further, they explored how either patient group is associated with attention-deficit hyperactivity disorder (ADHD). Opioid use disorder patients were recruited either from the community (n = 142; M age = 35.8 years; 38.7% female) or prison (n = 133; M age = 35.7 years; 21.8% female). A three-class solution was achieved with the latent class analysis: (1) a class comprising of subjects with a relatively low chance of current psychiatric comorbidities, except for a high probability of substance use disorders; (2) a class with considerably increased chances of current and recurrent psychiatric comorbidities, especially for major depression; and (3) a class with very few chances of psychiatric comorbidities, except for moderate probabilities of substance use disorders and antisocial personality disorder. The risk for psychiatric comorbidities seemed higher among PrG patients vs OMT patients, so practitioners should recognize the high prevalence of psychiatric comorbidities in patients with gambling disorder and individuals with ADHD to improve their response.