1.Identify how widespread it is2.Identify unmet need for services (untreated cases)a.Need to know what type of services are neededb.Need to know who we need to get to3.Examine group differences in ratesa.A lot of studied are now being done on children because we’ve seen anincrease in diagnose of children4.Discover causes and course of disordersa.Family, work related problems, etc.5.Overcome “clinical illusions” (closer to “true prevalence”)a.This is only a representation of people who go into treatment and not the population as a whole.Problem with measuring mental disorders in the populationConcept validity: something that you’re supposed to be measuring; “I’m going to measure mental disorder, not their abusive family”, etc.Sensitivity to prevent false negatives (pg. 30)-They can rule out the people that do NOT belong in the group that is beingstudied.-If there is not sensitivity, then there is a false negative in the experiment.Selectivity to prevent false positives (major problem)-Applying the criteria so specifically in order to not get a false positive.Three major studies:1.ECAa.Completed in the early 1980sb.Was randomized to 5 areas close to each other; (East Coast is differentfrom the West Coast); not nationally representedc.Diagnostic Interview Schedule (DIS) – standardized instrument based on DSM criteria; were given federal to finishd.The first landmark study that studied mental illnesses across the population.e.14% suffered from alcohol disorder2.NCS (1994)
3.NCS-RHow to measure: standardized instrumentsLimitations of such studies: Look at tables on page 52 and page 57Findings What is the difference in terms of any of the mental disorders?Difference in rate at any given time over a lifetime, what percentage of peoplewould experience a mental disorder?o46% of the population (nearly half)In the past year, what is the percentage of people who met the criteria for a mental disorder?o30%In 2004 by the NCS-R, 3-6% of the population suffer from a serious mental disorder in a one-year prevalence. (ages 18-59)oHowever, in a recent study in 2009 from another source, the mental disorder count increased to 4-8% of the population.Out of the 46% who had a mental disorder, 27% of those people had mental disorders had more than one mental disorder in their lifetimeOut of the 46%, 17% had three or more mental disorders in their lifetime.
- Summer '08