Accuracy of quantity-frequency and graduated frequency questionnaires in measuring alcohol intake: comparison with daily diary and commonly used laboratory markers.

Abstract

AIMS To ascertain the accuracy of a quantity-frequency questionnaire (QF) and a graduated frequency questionnaire (GF) as methods of obtaining self-reported alcohol intake in relation to a daily diary and biochemical tests. METHODS QF and GF data were obtained before and after a 1-month daily diary on alcohol intake in a sample of 52 volunteers aged 20-63 years, of whom 43 were female. A blood sample to measure serum aspartate aminotransferase (ASAT), alanine aminotransferase (ALAT), gamma-glutamyltransferase (GGT) and % carbohydrate-deficient transferrin (CDT) was obtained at the outset. RESULTS Both QF and GF correlated closely with daily diary intake (r > 0.90). Compared with a daily diary, the mean QF intake was slightly lower, whereas the mean GF intake was 2-fold. The apparent overestimation by GF was independent of the actual consumption level. Self-reported alcohol intake by each method correlated closely with serum ASAT, ALAT and GGT (r = 0.41-0.67) but not with CDT. CONCLUSIONS In adults motivated to recall alcohol intake, both QF and GF classify individuals in the correct rank order, but GF probably overestimates actual alcohol consumption.

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@article{Poikolainen2002AccuracyOQ, title={Accuracy of quantity-frequency and graduated frequency questionnaires in measuring alcohol intake: comparison with daily diary and commonly used laboratory markers.}, author={Kari Poikolainen and Irina M. Podkletnova and Hannu Alho}, journal={Alcohol and alcoholism}, year={2002}, volume={37 6}, pages={573-6} }