Polysubstance Dependence - Epidemiology

Epidemiology

There are not very many studies that have examined how often polysubstance dependence occurs or how many people are dependent on multiple substances. However, according to a study that analyzed the results from the National Epidemiological Survey on Alcohol and Related Conditions, approximately 215.5 out of a total of 43,093 individuals in the United States (0.5%) met the requirements for polysubstance abuse/dependence. Another study suggested that the number of new cases of polysubstance dependence has been going up. This idea was supported by a study that took place in Munich, Germany. A group of researchers chose to look at responses to a survey using the M-Composite International Diagnostic Interview (M-CIDI). The M-CIDI is a version of the Composite International Diagnostic Interview (CIDI). The researchers collected data from 3,021 participants, all between the ages of 14 and 24, to estimate the prevalence, or total number of cases, of drug abuse/dependence and of polysubstance abuse/dependence. The results of this study indicated that of the 17.3% who said that they regularly used drugs, 40% said that they used more than one substance, but 3.9% specifically reported using three or more substances, indicating that there is a lot of overlap in the use of different substances. The researchers compared their results to earlier German studies and found that substance dependence seems to be increasing, at least in Germany.