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Why problem drinking during adolescence is never a 'phase' (2/27/2011)

<
Tags:
adolescents

  • The Rutgers Alcohol Problem Index (RAPI) is widely used to assess adolescent drinking-related problems.
  • Researchers used adolescent RAPI scores to
examine diagnoses of alcohol dependence during young adulthood.
  • More drinking-related problems experienced at age 18 were associated with a diagnosis of alcohol dependence at age 25, and this predictive
association was stronger in females than males.

The Rutgers Alcohol Problem Index (RAPI) is widely used to assess adolescent drinking-related problems. The predictive power of RAPI scores, however, has not been examined on a longitudinal basis. A new study of RAPI has confirmed that not only is it an effective screening assessment, but that it may also - when administered in late adolescence - be predictive of alcohol diagnoses seven years later.

Results will be published in the May 2011 issue of Alcoholism: Clinical & Experimental Research and are currently available at Early View.

"RAPI is a self-report questionnaire on the frequency with which an adolescent has experienced 23 consequences of drinking
alcohol, such as getting into a fight with a friend or family
member, in the preceding 18 months," explained Richard J. Rose, Professor Emeritus in psychology and brain science at Indiana University, Bloomington. "This is the first study in which adolescent RAPI scores were used to
predict later diagnoses of alcoholism. And it is the first study of
pairs of twin brothers and sisters who differ in their RAPI scores to
ask whether these co-twins later differ, as expected, in alcohol
outcomes. They do."

"It might seem silly to even question the existence of a direct pathway from problem drinking to alcohol dependence in that alcohol dependence is clearly the culmination of an escalating pattern of heavy and problem drinking," noted Matt McGue, a professor in the department of psychology at the University of Minnesota. "The issue here though is whether drinking in adolescence carries particular weight in the development of alcohol dependence in adulthood. That is, adolescents, because of social factors or because their brains are still developing, may be especially susceptible to the effects of heavy drinking."

Rose and his colleagues assessed 597 Finnish twins (300 male, 297 female) at age 18 with RAPI, and later interviewed them at age 25 with the Semi-Structured Assessment of the Genetics of Alcoholism to assess alcohol abuse and dependence diagnoses.

"The key finding was that the more drinking-related problems experienced
by an adolescent at age 18, the greater the likelihood that adolescent would be diagnosed with alcoholism seven years later, at age 25," said Rose. "That predictive
association was stronger in females than males, and was confirmed in
within-family comparisons of co-twins who differed in their age 18 RAPI
scores. The analysis of co-twins ruled out factors such as parental
drinking and household atmosphere as the source of the association, because twins jointly experience these."

"Certainly RAPI is predictive of later risk of alcohol dependence," said McGue. "This means that RAPI can be used to identify a group of late-adolescents who are at high risk for developing alcohol dependence."

However, he added, this may not reflect so much a direct causal effect of adolescent drinking as it does that individuals who transgress social norms in adolescence by drinking heavily may be those same individuals who transgress social norms in adulthood by drinking abusively.

"In this alternative conceptualization, the major risk factor is thought to be behavioral disinhibition," said McGue. "The innovation in this study is that the authors were able to confirm the association of adolescent drinking with alcohol dependence within twin pairs. Since twins tend to have similar levels of behavioral disinhibition, showing that the heavy drinking twin was more likely to be alcohol dependent in part controls for the confounding with behavioral disinhibition.

"Furthermore," he added, "we do not really know why some with high RAPI scores did not become alcohol dependent and conversely why some with low scores did. It will be important in future research to investigate whether factors such as behavioral disinhibition can help account for these discrepancies."

Rose said these findings have important implications for clinicians. "The first step in intervention is to identify those at elevated risk," he said. "Screening for
drinking-related problems in adolescence may reliably identify many of
those at elevated risk for development of alcoholism, and a
self-report instrument such as RAPI offers an efficient approach for
such screening. Our results suggest that RAPI is not only an efficient
screening assessment; it is an effective one, now shown to be
predictive of diagnosed alcohol outcomes."

"While this association may not seem surprising," said Rose, "the strength of the association, in females as well as in males, and in co-twins who differ in drinking
but share their childhood environments and half or all of their
segregating genes, was of surprise."

"I would say for sure that heavy drinking in adolescence is a real danger sign, regardless of whatever the causal mechanisms are," added McGue. "Heavy drinking in adolescence is an indication that preventive intervention is warranted."

Note: This story has been adapted from a news release issued by the Alcoholism: Clinical & Experimental Research

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