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The psychometric assessment of alcoholism in forensic groups: the MacAndrew scale and response bias
O E Wasyliw1, T W Haywood, L S Grossman
1Rush Medical College.
Abstract:
Although the MacAndrew Alcoholism scale is the most widely used Minnesota Multiphasic Personality Inventory (MMPI) measure of vulnerability to alcohol abuse, its accuracy has not been studied in patients intrinsically motivated to exaggerate or minimize psychopathology. We examined the usefulness of the MAC in predicting alcohol abuse in a forensic clinical sample. Results indicate the MAC (a) was not more effective than direct inquiry in this group, (b) scores were correlated negatively with minimization and positively with exaggeration for subjects with histories of alcohol abuse, (c) offered advantages over direct inquiry both in screening for alcohol history (sensitivity) and in confirming it (specificity), and (d) scores were only moderately more accurate in valid than in minimized or exaggerated MMPI protocols. The results suggest that clinicians should use the MAC cautiously, particularly when they suspect motivation to minimize psychopathology.
Insights
The MacAndrew Alcoholism scale (MAC) is not more effective than direct inquiry for predicting alcohol abuse in forensic patients. Clinicians should cautiously use the MAC, especially when psychopathology minimization is suspected.
Area of Science:
- Psychology
- Forensic Psychology
- Clinical Psychology
Background:
- The MacAndrew Alcoholism scale (MAC) is a widely used Minnesota Multiphasic Personality Inventory (MMPI) measure for alcohol abuse vulnerability.
- Its accuracy in forensic populations with potential response biases (exaggeration or minimization) remains understudied.
Purpose of the Study:
- To evaluate the utility of the MAC scale in predicting alcohol abuse within a forensic clinical sample.
- To assess the MAC scale's performance in the presence of response biases.
Main Methods:
- The study examined the MacAndrew Alcoholism scale's effectiveness in a forensic sample.
- Direct inquiry and MMPI protocols with varying validity (valid, minimized, exaggerated) were analyzed.
Main Results:
- The MAC scale was not superior to direct inquiry for predicting alcohol abuse in this group.
- MAC scores showed a negative correlation with minimization and a positive correlation with exaggeration in subjects with alcohol abuse histories.
- While offering some advantages in sensitivity and specificity over direct inquiry, MAC accuracy was only moderate in valid MMPI protocols compared to biased ones.
Conclusions:
- The MacAndrew Alcoholism scale should be used with caution in forensic settings, particularly when patients may be motivated to minimize psychopathology.
- Direct inquiry remains a valuable tool, and clinicians should consider potential response biases when interpreting MAC scores.