North American clinicians generally use alcohol-use disorder criteria as defined in the Diagnostic and Statistical Manual of Mental Disorders, Fourth Edition (DSM-IV). Concerns exist, however, about the appropriateness of these criteria for adolescents.
For the first time, a study in the May 2005 issue of Alcoholism: Clinical & Experimental Research uses a single representative sample of the U.S. population to examine the effects of age, gender, race/ethnicity, and drinking status on the prevalence of DSM-IV diagnostic criteria among both adolescents and adults.
"DSM-IV criteria were developed with clinical adult populations," said Thomas C. Harford, a senior research analyst with CSR, Incorporated and first author of the study. "However, when compared to adults, drinking among adolescents is relatively infrequent and drinking histories tend to have shorter durations. Consequently, many symptoms such as withdrawal and alcohol-related medical complications are not typically experienced by adolescents."
"Recent research with adolescent clinical and community samples has identified important limitations of DSM-IV criteria when applied to adolescents," added Christopher Martin, associate professor of psychiatry and psychology at the University of Pittsburgh School of Medicine. "These include, one, that the dependence symptoms of tolerance, 'much time spent' using, and using more/longer than intended appear to often be over diagnosed in adolescent studies; two, that the ways in which these dependence criteria are measured has a huge downstream impact on the estimated prevalence of abuse and dependence diagnoses; and three, that certain alcohol-use disorder criteria may have different meanings when applied to adults and adolescents.
Harford and his colleagues used data from the 2001 National Household Survey on Drug Abuse. Of the 55,561 survey subjects, 33,576 (60.5 percent) reported alcohol use in the previous year and also provided information on DSM-IV alcohol-use disorder criteria. DSM-IV alcohol-use disorder criteria were assessed by questions related to specific symptoms that had occurred during the previous 12 months.
Dependence or Abuse?
Results indicate that the most prevalent criteria of DSM-IV alcohol dependence were "tolerance" and "time spent obtaining alcohol, drinking, or getting over its effects." The most prevalent criterion of DSM-IV alcohol abuse was "hazardous use." The high prevalence of "tolerance," "time spent," and "hazardous use" among the adolescent sample is consistent with findings from other adolescent studies."Similar findings have been reported in clinical studies," said Harford, "and the age-specific distributions for these criteria conform to the age-specific distributions of alcohol use - increasing use with increasing age up to ages 21-22, followed by lower use with increasing among respondents aged 23 years and older. The lower proportion of adolescents endorsing these criteria, when compared to younger adults, is consistent with the higher proportions of non-drinkers among adolescent populations."
Two Symptoms Over-Diagnosed
Martin concurred. "Similar to what has been suggested in research using only adolescents, this study found that, relative to other criteria, the dependence criteria of tolerance and time spent using were larger among adolescents and young adults compared to other age groups. For example, a great deal of time spent using, obtaining or recovering from alcohol may reflect difficulties in obtaining the substance rather than compulsive patterns of drinking. These data suggest that these two symptoms may be over-diagnosed in adolescents, which would lead to higher rates of dependence diagnoses in these age groups."Results also indicate that variation in the wording of specific symptom items may have a strong influence on the diagnosis of abuse and dependence.
Criteria Could Be Improved
"In the present study, two items for 'tolerance' yielded similar proportions of positive response, but these proportions were shown to vary by age group," said Harford. "Higher proportions of younger respondents endorsed the item 'drank more for same effect,' and higher proportions of older respondents endorsed 'less effect from same amount.' ""These findings are important because valid diagnostic criteria are critical for advances in research, treatment and prevention," said Martin. "This study suggests ways in which criteria and the way they are measured could be improved to better serve the adolescent age group. Who is and is not given an alcohol-use disorder diagnosis among adolescents can help determine insurance coverage for treatment for a large number of youth."
