Common mental health disorders affect as many as one in six people in the community. The 2007 ONS household survey of adult psychiatric morbidity in England found that 16.2% of 16-64 year olds were suffering from an anxiety or depressive disorder. Of those 4.4% were diagnosed with generalised anxiety disorder (GAD); 3.0% with post-traumatic stress disorder (PTSD); 2.3% with major depression; 1.4% with phobias; 1.1% obsessive compulsive disorder (OCD); and 1.1% with panic disorder. The conditions are not mutually exclusive and the most common problem was mixed anxiety and depression, found in 9% of patients. The diagnoses were established through diagnostic psychiatric interviews with subjects screening positive in the survey.These disorders are even more common in primary care. The New Zealand Magpie Study found that 20.7% of people presenting to primary care had suffered a common mental health disorder over a 12-month period, compared with 14.8% in the community.