There were differences in how participants were classified using the 3 AUDIT-C metrics. A comparison of groups based on the AUDIT-C closest to the PEth date with groups based on the highest AUDIT-C showed that 43% of subjects were classified in a higher group using the longitudinal metric (Table 2a). Comparing closest AUDIT-C with AUDIT-C trajectory, 38% of subjects were classified differently using the longitudinal metric (Table 2b); 18% to a lower group and 20% to a higher group. Comparing highest AUDIT-C groups with AUDIT-C trajectories (Table 2c), 54% were classified in a lower category with the trajectory metric. Correlation coefficients for the three AUDIT-C metrics were 0.55 for closest and highest, 0.56 for closest and trajectory, and 0.86 for the two longitudinal metrics: highest and trajectory.
