A Brief Overview of Base Rates -- Control Groups: Adult Control Groups -- College students -- Combat veterans -- Community members -- Family practice -- General practice patients -- Internal medicine -- Litigants -- Medical and Dental students -- Neurology -- Nonsmokers -- Normal -- Occupational -- Psychiatric adults -- Child and Adolescent Control Groups -- Clinic referred children -- Delinquents -- Elementary school children -- High school students -- Psychiatric referred children -- Secondary school students -- Special Education students -- Elderly Control Groups -- Alzheimer’s disease spouses -- Frail elderly -- Nursing home -- References -- Symptom Index.