The Effect of Drinking Intensity and Frequency on Serum Carbohydrate‐Deficient Transferrin and γ‐ Glutamyl Transferase Levels in Outpatient Alcoholics

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Abstract
Whereas heavy alcohol consumption is known to elevate serum carbohydrate‐deficient transferrin (CDT) and γ‐glutamyl transferase (GGT) levels, the contribution of drinking pattern to these effects is not completely understood. We present data on 423 men and 146 women evaluated 1 year after treatment in a large‐scale alcoholism treatment study (Project MATCH). Relationships between drinking frequency (number of days drinking), intensity (drinks per drinking day), and blood levels of CDT and GGT were analyzed by using response surface regression models and thin‐plate spline‐smoothing techniques. Both models indicated differences between CDT‐ and GGT‐drinking pattern relationships in men and, also, a difference between men and women in CDT drinking‐pattern relationships. For men, CDT levels appeared to respond primarily to frequency of drinking, whereas GGT was influenced primarily by drinking intensity. For women, both CDT and GGT were influenced more by drinks per drinking day (intensity) than by number of days drinking (frequency). The data confirm both the independent nature of these biological markers of alcohol consumption and gender differences in alcohol‐induced CDT response reported previously.

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