<qa>  What percentage of patients attend primary care clinics meet the DMS IV criteria?Substance abuse disorders are a major public health problem. With a current prevalence rate of 18, substance abuse and dependence costs the nation over 300 billion per year in treatment costs and lost productivity. Approximately 20 of all patients attending primary care clinics and 35 of all patients attending psychiatric clinics meet Diagnostic and Statistical Manual IV DSM IV criteria for substance abuse or dependence. 