Table 4.
Baseline characteristics for participants in the frequent-heavy hidden state in comparison to other Study 2 participants with moderate drinking.
| Characteristic | Continual Frequent-Heavy Drinkers (n = 119) a | Itinerant Frequent-Heavy Drinkers (n = 27) a | Total Frequent-Heavy Drinkers (n = 146) | Total Moderate b Drinkers (n = 2020) | t/Z | p c |
|---|---|---|---|---|---|---|
| Gender: M (%)/W (%) | M = 63 (52.9%)/W = 56 (47.1%) | M = 13 (48.1%)/W = 14 (51.9%) | M = 76 (52.1%)/W = 70 (47.9%) | M = 628 (31.1%)/W = 1392 (68.9%) | Z = −5.2231 | <0.0001 |
| Age: mean (SD) | 30.4 (10.2) | 25.7 (4.1) | 29.5 (9.5) | 25.6 (6.2) | t = 4.9661 (df = 154.06) |
<0.0001 |
| Measures of alcohol consumption: means (SD) | ||||||
| AUDIT score (scale 0–40) | 14.1 (6.1) | 12.4 (4.3) | 13.8 (5.8) | 10.8 (4.1) | t = 6.206 (df = 155.82) |
<0.0001 |
| Quantity (standard glasses/week) | 17.3 (10.6) | 12.4 (8.5) | 16.4 (10.4) | 8.9 (6.0) | t = 8.63 (df = 152.1) |
<0.0001 |
| Frequency (drinking occasions/week) | 5.0 (1.2) | 3.2 (1.3) | 4.6 (1.4) | 2.2 (1.0) | t = 20.801 (df = 157.46) |
<0.0001 |
| Binge occasions (no. per week) |
1.5 (1.4) | 1.2 (1.1) | 1.4 (1.4) | 1.0 (0.86) | t = 3.6129 (df = 153.12) |
0.0004 |
| Average eBAC d per week | 0.033 (0.028) | 0.019 (0.017) | 0.031 (0.027) | 0.018 (0.017) | t = 5.5123 (df = 153.36) |
<0.0001 |
| Peak eBAC e within past month | 1.53 (1.09) | 1.48 (0.78) | 1.52 (1.04) | 1.34 (0.87) | t = 2.0771 (df = 160.1) |
0.004 |
| Percent (%) over weekly recommended level | 81 (68.1%) | 13 (48.1%) | 94 (64.4%) | 575 (28.5%) | Z = 9.0714 | <0.0001 |
| Motivation to change drinking behavior (scale 0–10) | 5.1 (2.7) | 3.9 (3.0) | 4.8 (2.7) | 4.0 (2.6) | t = 3.5199 (df = 164.37) |
0.0006 |
a: The data presented on continual and itinerant frequent-heavy drinkers are descriptive only and are not included in the statistical comparisons shown. b: The term “moderate drinkers” is used here to describe the participants in seven of the eight hidden classes who were non-excessive or excessive drinkers who preferred to drink on one day a week. The statistical comparisons in this table are between two groups only—total frequent-heavy drinkers (n = 146) and participants with moderate drinking, a group that thus included some participants with excessive weekly drinking who were not members of the frequent-heavy group. c: p-values are based on Welch two-sample t-test for age, AUDIT, quantity, frequency, binge occasions, average eBAC, and peak eBAC; a Z-score proportions test was used for gender and for percent over weekly recommended level. d: Estimated average percentage blood alcohol count (BAC) per week. e: Estimated average peak percentage BAC within the past month.