Department of Internal Medicine, Alcohol Unit, BH10, CHUV1011 Lausanne, Switzerland
Received 2 March 2000; in revised form 12 June 2000; accepted 8 July 2000
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ABSTRACT |
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INTRODUCTION |
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Given the difficulties clinicians experience in identifying patients' susceptibility to alcohol use disorders, this study explores the association between SRE scores and alcohol-related diagnoses in a sample of primary care patients, and the potential of the SRE score to screen patients for alcohol abuse or dependence.
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SUBJECTS AND METHODS |
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The SRE has four questions assessing retrospectively the subjective effect of drunkenness experienced during three separate time points: the first five times alcohol was imbibed, the period of heaviest drinking, and the most recent 3 months. In order to explore the relationship between alcohol use disorders and tolerance corresponding to early experiences with alcohol (the native tolerance), the analyses reported here focused on the SRE score for the first five experiences with alcohol (the Early SRE), which was computed by dividing the sum of the number of drinks recorded in the four possible cells of the first five experiences with alcohol by the number of cells endorsed. The Total SRE score reflects combined native and acquired tolerance to alcohol, computed by dividing the sum of the number of drinks recorded in the 12 possible cells of the SRE by the number of cells endorsed.
One drink was defined as the amount of alcohol contained in 12 ounces of beer, 4 ounces of wine, or a single shot of 80 proof beverage. DSM-IV diagnoses of alcohol abuse and dependence were assessed through questions extracted from the French-validated version of the Diagnostic Interview for Genetic Studies (DIGS) (A. Berney et al., unpublished study).
For the analyses reported here, the patients were divided into two groups based on their lifetime histories of alcohol abuse or dependence. Mean comparisons between groups on Total SRE score and demographic characteristics were made with Student's t-tests for continuous variables and with the 2-test for categorical variables. A logistic regression analysis was performed to determine if the SRE score independently predicted a history of alcohol abuse or dependence in the presence of demographic characteristics. Finally, the area under receiver operating characteristic (AUROC), illustrated by a ROC curve, was calculated to describe the sensitivity and specificity of the SRE to identify patients with alcohol abuse or dependence with various SRE cut-offs.
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RESULTS |
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The mean Early SRE score for these 244 primary care patients was 3.1 ± 2.90 drinks, 56 (23.0%) of them endorsed criteria for a lifetime diagnosis of alcohol abuse, and 31 (12.7%) for alcohol dependence. Comparing the mean Early SRE scores of the 87 patients with alcohol abuse or dependence to the scores of the 157 subjects who never met diagnostic criteria indicated evidence of higher Early SRE score in patients with alcohol abuse or dependence (4.0 ± 3.60 vs 2.5 ± 2.27, respectively; t = 3.53, P = 0.001).
In order to verify that the finding of higher Early SRE score in patients with an alcohol-related diagnosis was not a reflection of demographic differences between alcoholics and non-alcoholics, the two groups were compared (results not reported) regarding age at interview, sex ratio, employment, and country of origin. Subjects with abuse or dependence were younger than those without alcohol-related diagnoses (37.1 ± 13.34 and 45.4 ± 20.08 respectively; t = 3.85, P < 0.001), and there was a larger proportion of men (79.3%) among subjects with alcohol abuse or dependence compared to those without such diagnoses (45.9%; 2 = 25.68, P < 0.001). The two groups were, however, similar regarding employment and country of origin.
Because differences in age and sex ratio might have generated differences in Early SRE score observed between the two groups, a logistic regression analysis was computed to verify that the difference in Early SRE score observed between patients with and without alcohol use disorder persisted in the presence of demographic variables such as age, sex, employment, and country of origin. Although not reported, results indicated that the Early SRE score independently predicted alcohol abuse or dependence (standardized coefficient beta = 0.12, t = 2.07, P < 0.05) in the presence of the demographic variables included in the model.
Finally, the sensitivity and specificity of the Early SRE score to identify subjects with alcohol abuse or dependence was explored through an AUROC analysis illustrated with the ROC curve shown in Fig. 1. Results demonstrated that the AUROC was 0.69, and considering a Total SRE score cut-off of 2, the instrument identified 84% of the subjects with alcohol abuse or dependence (sensitivity), while 57% of those without such diagnosis were correctly classified (specificity).
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DISCUSSION |
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In interpreting these results, it is important to note that retrospective analyses such as these might be biased by recent drinking experiences. However, other analyses, including those from prospective studies, have demonstrated that SRE values generated at about age 40 years correlated with the results of alcohol challenges carried out 15 years previously (Schuckit et al., 1997b), suggesting that the current data might represent a real phenomenon rather than just poor recollection.
Additional limitations in these data should be acknowledged. The majority of patients were Caucasian and male, so results may not generalize to women and other ethnic groups. Finally, despite efforts to optimize the accuracy of the data through personal interviews, no resource persons were available to corroborate information provided by the patients; therefore the data depend on both the truthfulness of subjects and on the accuracy of their recollections of early drinking experiences. Further studies in this area will therefore need to address these limitations.
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APPENDIX |
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FOOTNOTES |
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REFERENCES |
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Schuckit, M. A. (1994) Low level of response to alcohol as a predictor of future alcoholism. American Journal of Psychiatry 151, 184189.[Abstract]
Schuckit, M. A. and Smith, T. L. (1996) An 8-year follow-up of 450 sons of alcoholic and control subjects. Archives of General Psychiatry 53, 202210.[Abstract]
Schuckit, M. A., Smith, T. L. and Tipp, J. E. (1997a) The self-rating of the effects of alcohol (SRE) form as a retrospective measure of the risk for alcoholism. Addiction 92, 979988.[ISI][Medline]
Schuckit, M. A., Tipp, J. E., Smith, T. L., Wiesbeck, G. A. and Kalminjn, J. (1997b) The relationship between self-rating of the effects of alcohol and alcohol challenge results in ninety-eight young men. Journal of Studies on Alcohol 58, 397404.[ISI][Medline]