PAIN management HEALTH GOVERNMENT agencies AGE distribution ANALGESICS BLACK people CHI-squared test DRUG prescribing EDUCATION EPIDEMICS LENGTH of stay in hospitals PATIENT aftercare INCOME INTERVIEWING LONGITUDINAL method MEDICAL appointments MEDICAL needs assessment MEDICAL care costs NARCOTICS PHARMACOLOGY POPULATION QUESTIONNAIRES REGRESSION analysis SUBSTANCE abuse SURVEYS WHITE people WOUNDS & injuries PHYSICIAN practice patterns SOCIOECONOMIC factors DRUG abusers CONTROL groups DISEASE incidence ACQUISITION of data HUMAN research subjects PATIENT selection DATA analysis software DESCRIPTIVE statistics