Studies show that BDD is common non-clinical places and clinical places. Research was done on 200 people with DSM-IV BDD. These people were aged 12 and older. They were interviewed. The people with BDD were found from 'mental-health doctors', advertisements, their friends and family, and non-psychiatrist physicians. 53 of the 200 people were receiving medication, 33 were receiving psychotherapy, and 48 were receiving both medication and psychotherapy. How bad each person's BDD was, was assessed using the "Yale-Brown Obsessive Compulsive Scale", modified for BDD. Symptoms were assessed with the Body Dysmorphic Disorder Examination. Both tests were made just for BDD. The results showed that BDD is in 0.7% - 1.1% of community samples and 2%-13% of non-clinical samples. 13% of psychiatric patients had BDD. Research also found that some of the patients who were firstly diagnosed with OCD, also had BDD. 53 patients with OCD and 53 patients with BDD were compared to each other in research. Clinical features, comorbidity, family history, and population features were compared between the two groups. 9 of the 62 subjects (14.5%) of those with OCD also had BDD.