Screening for Alcohol Problems What Makes a Test Effective? Scott H. Stewart, M.D., and Gerard J. Connors, Ph.D. Screening tests are useful in a variety of settings and contexts, but not all disorders are amenable to screening. Alcohol use disorders (AUDs) and other drinking problems are a major cause of morbidity and mortality and are prevalent in the population; effective treatments are available, and patient outcome can be improved by early detection and intervention. Therefore, the use of screening tests to identify people with or at risk for AUDs can be beneficial. The characteristics of screening tests that influence their usefulness in clinical settings include their validity, sensitivity, and specificity. Appropriately conducted screening tests can help clinicians better predict the probability that individual patients do or do not have a given disorder. This is accomplished by qualitatively or quantitatively estimating variables such as positive and negative predictive values of screening in a population, and by determining the probability that a given person has a certain disorder based on his or her screening results. KEY WORDS: AOD (alcohol and other drug) use screening method; identification and screening for AODD (alcohol and other drug disorders); risk assessment; specificity of measurement; sensitivity of measurement; predictive validity; Alcohol Use Disorders Identification Test (AUDIT) he term “screening” refers to the confirm whether or not they have the application of a test to members disorder. When a screening test indicates SCOTT H. STEWART, M.D., is an assistant Tof a population (e.g., all patients that a patient may have an AUD or professor in the Department of Medicine, in a physician’s practice) to estimate their other drinking problem, the clinician School of Medicine and Biomedical probability of having a specific disorder, might initiate a brief intervention and Sciences at the State University of New such as an alcohol use disorder (AUD) arrange for clinical followup, which York at Buffalo, Buffalo, New York. (i.e., alcohol abuse or alcohol depen- would include a more extensive diag­ dence). (For a definition of AUDs and nostic evaluation (Babor and Higgins- GERARD J. CONNORS, PH.D., is director other alcohol-related diagnoses, see the Biddle 2001). and a senior research scientist at the sidebar “Definitions of Alcohol-Related Regardless of the context in which Research Institute on Addictions, State Disorders.”) Screening is not the same screening tests are administered and University of New York at Buffalo, as diagnostic testing, which serves to the subsequent responses, it is impor- Buffalo, New York. establish a definite diagnosis of a disor- tant to have an appreciation of the der; screening is used to identify people strengths and limitations of screening Dr. Stewart gratefully acknowledges career who are likely to have the disorder. These tests. Accordingly, the main purpose of development support from the National people are often advised to undergo more this article is to review the characteris- Institute on Alcohol Abuse and Alcoholism detailed diagnostic testing to definitively tics of screening tests that influence (NIAAA) through grant K23–AA–014188. Vol. 28, No. 1, 2004/2005 5 Definitions of Alcohol-Related Disorders A variety of terms are used in the scientific literature to • Tolerance, as defined by either of the following: describe alcohol use disorders (AUDs) and other condi­ tions characterized by excessive alcohol consumption. – A need for increased amounts of alcohol to AUDs are disorders for which specific diagnostic criteria achieve intoxication or the desired effect. exist, as defined in two disease classification systems— the Diagnostic and Statistical Manual of Mental Disorders – Markedly diminished effect with continued use (DSM), devised by the American Psychiatric Association of the same amount of alcohol. (APA), and the International Classification of Diseases (ICD), by the World Health Organization (WHO). • Withdrawal, as manifested by either of the following: DSM Criteria – The characteristic withdrawal syndrome. The most recent version of the DSM, the DSM–IV–TR – Use of alcohol to relieve or avoid withdrawal (APA 2000), includes two AUDs, alcohol abuse and alcohol symptoms. dependence, which have the following diagnostic criteria: • Drinking alcohol often in larger amounts or over a Alcohol Abuse. Alcohol abuse is defined as a maladaptive longer period than was intended. pattern of alcohol use leading to clinically significant impairment or distress, as manifested by the occurrence • A persistent desire or unsuccessful efforts to cut of one (or more) of the following within a 12-month period: down or control alcohol use. • Recurrent alcohol use resulting in a failure to fulfill • A great deal of time spent in activities necessary to major role obligations at work, school, or home obtain alcohol, use it, or recover from its effects. (e.g., repeated absences or poor work performance related to alcohol use; alcohol-related absences, •Giving up or reducing important social, occupa­ suspensions, or expulsions from school; neglect tional, or recreational activities because of alcohol use. of children or household). • Continued alcohol use despite having a persistent or • Recurrent alcohol use in situations in which it is recurrent physical or psychological problem that is physically hazardous (e.g., driving an automobile likely to have been caused or exacerbated by alcohol or operating a machine when impaired by alcohol). (e.g., continued drinking despite recognition that an ulcer was made worse by alcohol consumption). • Recurrent alcohol-related legal problems (e.g., arrests for alcohol-related disorderly conduct). Alcohol dependence may include physiological dependence if there is evidence of tolerance or withdrawal. • Continued alcohol use despite having persistent If neither of these is present, alcohol dependence is or recurrent social or interpersonal problems caused classified as being without physiological dependence. or exacerbated by the effects of alcohol (e.g., arguments with spouse about intoxication, physical fights). ICD Criteria In addition, the patient must have never met the The most recent version of the ICD, ICD–10 (World criteria for alcohol dependence in the past. Health Organization 1993), distinguishes between harm­ ful use and alcohol dependence syndrome. Harmful use Alcohol Dependence. Alcohol dependence is defined as a is defined as a pattern of alcohol use that is causing damage maladaptive pattern of alcohol use leading to clinically to health. The damage may be physical (e.g., hepatitis significant impairment or distress, as manifested by the following long-term alcohol use) or mental (e.g., depressive occurrence of three (or more) of the following at any episodes secondary to heavy alcohol intake). Harmful time in the same 12-month period: use commonly, but not invariably, has adverse social 6 Alcohol Research & Health Screening for Alcohol Problems consequences; social consequences in themselves, – Giving up or reducing important alternative however, are not sufficient to justify a diagnosis of pleasures or interests because of drinking. harmful use. The ICD criteria for alcohol dependence syndrome – Spending a great deal of time in activities are very similar to those for alcohol dependence in the necessary to obtain or consume alcohol, or DSM–IV–TR. They specify that three or more of the to recover from its effects. following manifestations should have occurred together for at least 1 month or, if persisting for periods of less than • Persistent alcohol use despite clear evidence of 1 month, should have occurred together repeatedly within a 12-month period: harmful consequences, as evidenced by continued use when the person is actually aware, or may be • A strong desire or sense of compulsion to consume expected to be aware, of the nature and extent of alcohol. harm. • Impaired capacity to control drinking in terms of its In addition to the diagnosis of alcohol dependence, onset, termination, or levels of use, as evidenced by the World Health Organization also uses the term “haz­ either of the following: ardous use,” which describes a pattern of substance use – Alcohol often taken in larger amounts or over a that increases the risk of harmful consequences for the longer period than intended. user. These may include not only physical and mental health consequences but also social consequences. In – A persistent desire or unsuccessful efforts to contrast to harmful use, hazardous use refers to patterns reduce or control alcohol use. of use that are of public health significance but do not meet the criteria for a current disorder in the drinker. • A physiological withdrawal state when alcohol is However, the term is not a diagnostic term in the reduced or ceased, as evidenced by either of the ICD–10. following: – The characteristic withdrawal syndrome for alcohol. Other Terms Used In addition to these specific diagnostic terms, various – Use of the same (or closely related) substance with the intention of relieving or avoiding with­ other terms are used in the literature, such as problem drawal symptoms. drinking, at-risk drinking, and problematic drinking. These terms can differ in their meanings and generally • Evidence of tolerance to the effects of alcohol, such are defined in the context of the specific study. that one of the following occurs: —Scott H. Stewart and Gerard J. Connors –An eed for significantly increased amounts