Short-term test–retest reliability of our consumption measures was available from 98 male and 171 female twins who were interviewed a mean of, respectively, 4.5 and 5.7 weeks after their initial MM2 or FF4 interview. The observed polychoric correlations for males (and females) were drink frequency +0.86 (+0.90), regular quantity +0.77 (+0.80), maximum quantity +0.85 (+0.86), and drunk frequency+ 0.72 (+0.82).
