sum of the weights used for that participant to calculate the age-adjusted mean AUDIT-C score. The mean scores were rounded to the nearest whole from 0–12 and higher scores were collapsed due to their relatively small sample sizes. This resulted in an eight-level ordinal measure of age-adjusted mean AUDIT-C scores: 0, 1, 2, 3, 4, 5, 6 or 7, and 8+.
