Table 1.
Sample characterization
| Frequent co-users | Alcohol only | |||
|---|---|---|---|---|
| Female | Male | Female | Male | |
| N | 8 | 16 | 41 | 47 |
| Age | 30.8 (8.2) | 30.9 (7.2) | 34.1 (10.8) | 36.1 (10.2) |
| Income | ||||
| $0–29,999 | 50.0% | 37.5% | 43.9% | 57.4% |
| $30,000–59,999 | 50.0% | 50.0% | 36.6% | 17.0% |
| Over $60,000 | 0% | 12.5% | 19.5% | 25.5% |
| Percent Hispanic | 75.0% | 50.0% | 46.3% | 46.8% |
| Race | ||||
| White | 50.0% | 56.3% | 63.4% | 63.8% |
| Black | 0.0% | 6.3% | 4.9% | 6.4% |
| Asian | 12.5% | 12.5% | 4.9% | 4.3% |
| American Indian | 25.0% | 12.5% | 26.8% | 23.4% |
| Native Hawaiian | 0.0% | 0.0% | 0.0% | 2.1% |
| Number drinking days | 49.1 (23.8) | 55.3 (23.0) | 46.1 (23.9) | 44.8 (27.1) |
| Drinks per drinking day | 5.9 (2.8) | 6.4 (2.4) | 5.7 (3.5) | 6.5 (4.8) |
| Drinks per day | 3.7 (3.6) | 3.9 (2.3) | 3.2 (3.7) | 3.4 (3.8) |
| Percent heavy drinking days | 38% (37%) | 37% (34%) | 32% (26%) | 30% (31%) |
| Percent heavy days while drinking | 60% (34%) | 58% (37%) | 59% (31%) | 56% (36%) |
| Drinks per drinking day: Co-use day | 6.0 (2.7) | 6.5 (2.5) | - | - |
| Drinks per drinking day: Alcohol only-use day | 5.3 (1.7) | 6.2 (2.8) | 5.7 (3.5) | 6.5 (4.8) |
| Percent nicotine users | 50% | 75%* | 27%* | 19%* |
A larger proportion of male co-users used nicotine than both females and males who used alcohol only. Drinks per drinking day was computed by totaling the number of drinks consumed over the measured interval (90 days) and dividing by the total number of days in which alcohol was consumed, whereas drinks per day was computed by dividing the total number of drinks by the total number of days in the measured interval (i.e., 90). Similarly, percent heavy drinking days was computed by dividing the total number of days on which individuals had a binge episode and dividing by 90, whereas percent heavy days while drinking was computed by dividing the number of heavy drinking days by the number of days that a participant reported alcohol consumption.