Table 1.
Characteristics of participants randomized to a study group.
| Contingent (n=18) | Noncontingent (n=18) | Statistic | |
|---|---|---|---|
| Gender | 10 female (56%), 8 male (44%) | 11 female (61%), 7 male (39%) | Fisher’s exact p = 1.0 |
| Race | 2 African American (11%), 15 White (83%), 1 other race (6%) | 1 African American (6%), 15 White (83%), 2 other race (11%) | Fisher’s exact p = 1.0 |
| Age | 36.1 (SD = 9.9) | 39.2 (SD = 14.6) | t(34) = 0.76, p = .5 |
| Monthly Individual Income a | US$1823 (SD = US$1260; median = US$1550) | US$1687 (SD = US$1625; median = US$1250 | t(34) = 0.58, p = .6 |
| AUDIT | 21.2 (SD = 6.6) | 22.2 (SD = 5.6) | t(34) = 0.49, p = .6 |
| Drinks per day prior to study onset b | 3.9 (SD = 2.3) | 4.2 (SD = 3.3) | t(34) = 0.36, p = .7 |
| Treatment Services Review alcohol score | 0.8 (SD = 1.0) | 0.7 (SD = 0.7) | t(34) = 0.59, p = .6 |
| Years of heavy drinking c | 13.1 (SD = 7.0) | 12.5 (SD = 8.2) | t(34) = 0.24, p = .8 |
| ASI-lite Alcohol Composite c | 0.47 (SD = 0.17) | 0.56 (SD = 0.20) | t(34) = 1.46, p = .2 |
| Heavy drinking days self-reported in Monitoring phase | 4.1 (SD = 1.5) | 4.5 (SD = 1.6) | t(34) = 0.86, p = .4 |
| $1000 Delay Discounting Log(ED50) | 1.89 (SD = 0.84) | 2.39 (SD = 0.63) | t(34) = 2.02, p = .051 |
Note.
a
Income was square-root-transformed prior to group comparison to normalize the distributions.
b
30-day average preceding the consent session from the Timeline Follow-Back assessment.
c
From the Addiction Severity Index-lite.