The Effect of Inmate Populations on Estimates of DSM-IV Alcohol and Drug Use Disorders in the United States
To the Editor: Most national estimates of adult DSM-IV substance use disorder (e.g., National Epidemiologic Survey on Alcohol and Related Conditions [1], and National Survey on Drug Use and Health [2]) are based on household samples that exclude prison and jail inmates, populations known to have high rates of substance use disorders. To estimate the effect of excluding inmates, we present estimates of alcohol and drug use disorders for household and inmate populations and calculate the change in the overall prevalence of substance use disorder when these two populations are pooled.
Prevalence estimates for the combined U.S. household and inmate population are weighted averages of the survey-weighted prevalence estimates for the household population, state prison population, federal prison population, and jail population (1, 3–5). As seen in Table 1, details about interviewing and how weighted averages and standard errors were calculated are reported (also see the data supplement accompanying the online version of this letter).
Including inmates increased overall projected estimates of the number of persons in the United States aged ≥18 years with an alcohol use disorder by 877,000, from 17,580,000 to 18,457,000, a 5.0% increase over the base. Estimates of the number with an illicit drug use disorder increased by 1,043,000, from 4,159,000 to 5,202,000, a 25.1% increase. Overall prevalence of the specific alcohol abuse and dependence disorders increased over the base by 4.2% and 5.9% respectively, and illicit drug abuse and dependence increased by 12.0% and 53.8%.
High rates of DSM-IV substance use disorders among inmates combined with a large inmate population mean that many persons with alcohol and drug use disorders are missed by major U.S. national general population surveys. The undercount for both alcohol and illicit drug disorders is significant, but proportionately the undercount for alcohol disorders is modest while the proportionate undercount for illicit drug disorders, particularly illicit drug dependence (i.e., addiction), is large. These results likely would be accentuated for substances such as cocaine, methamphetamine, and heroin, which are rare in the household population (2) but common among inmates (4–5). In addition, prevalence rates may be particularly underestimated for men and for those minority populations that are overrepresented in the inmate population. To improve accuracy and cover the full range of cases, the U.S. surveillance system may need to be modified. In addition, further investigation of the effect of incarceration on estimates for specific subpopulations is warranted.
1 : Co-occurrence of 12-month alcohol and drug use disorders and personality disorders in the United States. Arch Gen Psychiatry 2004; 61:361–368 Crossref, Medline, Google Scholar
2 Substance Abuse and Mental Health Services Administration: Results From the 2008 National Survey on Drug Use and Health: National Findings (No. SMA 09-4434). Rockville, Md, Substance Abuse and Mental Health Services Administration, 2009 Google Scholar
3 US Department of Justice, Bureau of Justice Statistics: Prison and Jail Inmates at Midyear 2002 (NCJ 198877). Washington, DC, US Department of Justice, 2003. http://www.ojp.usdoj.gov/bjs/pub/pdf/pjim02.pdf Google Scholar
4 US Department of Justice, Bureau of Justice Statistics: Substance Dependence, Abuse, and Treatment of Jail Inmates, 2002 (NCJ 209588). Washington, DC, US Department of Justice, 2005. http://www.ojp.usdoj.gov/bjs/pub/pdf/sdatji02.pdf Google Scholar
5 US Department of Justice, Bureau of Justice Statistics: Drug Use and Dependence, State and Federal Prisoners, 2004 (NCJ 213530). Washington, DC, US Department of Justice, 2006. http://www.ojp.gov/bjs/pub/pdf/dudsfp04.pdf Google Scholar
6 US Department of Justice, Bureau of Justice Statistics: Mental Health Problems of Prison and Jail Inmates (NCJ 213600). Washington, DC, US Department of Justice, 2006 Google Scholar