Laboratory sample drinking intensity (DI) was characterized by the self‐reported maximum number of drinks in a 24 h period (Maxdrinks) during the 35 day timeline follow‐back interval, divided by four or five drinks for women and men respectively, a strategy comparable to that adopted in the epidemiological literature 9 , 12 , 13 and labelled as low‐risk if DI < 1 (N = 2), moderate‐risk if 1 ≤ DI < 2 (N = 11), high‐risk if 2 ≤ DI < 3 (N = 14), and extreme‐risk if DI ≥ 3 (N = 8). Given sample size concerns, the low‐risk group was excluded from all group‐based analyses, leaving a final analytical sample of 33 subjects. In the subsequent study, DI groups were created in COGA using the lifetime Maxdrinks variable. DI group demographic characteristics by sample are in Table 1A,B, with additional COGA sample data presented in Table S1B.
