“…Third, the OQ may be invalid in some diagnostic groups and treatment settings. Previous authors have expressed concerns that the OQ did not accurately measure distress in their patient populations, including somatoform disorders, psychotic disorders, and substance use disorders (Conijn, Emons, De Jong, & Sijtsma, 2015;MacFarlane, Henry, Nash, Kissel, & Bush, 2015). In an inpatient setting, Doerfler, Addis, and Moran (2002) found that those diagnosed with major depressive disorder scored higher on the SD subscale of the OQ-45 than those with schizophrenia and other severe mental illnesses (e.g., bipolar disorder).…”