Table 2.
Characteristics Associated with Paying the $75 Deposit
| Paid Deposit (n = 36) | Did Not Pay Deposit (n = 15) | Group Comparison Without Covariances | Logistic Model Predicting Payment | |
|---|---|---|---|---|
| Gender | 21 female (58%), 15 male (42%) | 3 female (20%), 12 male (80%) | Fisher’s exact p = .02 | χ2 = 1.13, p = .3 |
| Race | 3 African American (8%), 30 White (83%), 3 other race (8%) | 8 African American (53%), 7 White (47%), 0 other race (0%) | Fisher’s exact p = .001 | χ2 = 1.56, p = .2 |
| Age | 37.6 (SD = 12.4) | 41.3 (SD = 12.0) | t(49) = 0.98, p = .3 | χ2 = 0.07, p = .8 |
| Monthly Individual Income a | US$1755 (SD = US$1435; median = US$1500) | US$587 (SD = US$604; median = US$300 | t(49) = 2.99, p = .004 | χ2 = 7.24, p = .007 |
| AUDIT | 21.7 (SD = 6.0) | 24.5 (SD = 5.3) | t(49) = 1.60, p = .1 | χ2 = 0.41, p = .5 |
| Drinks per day prior to study onset b | 4.1 (SD = 2.8) | 7.0 (SD = 5.0) | t(17.9) = 2.10, p = .05 d | χ2 = 5.77, p = .02 |
| Treatment Services Review alcohol score | 0.8 (SD = 2.0) | 0.5 (SD = 0.5) | t(49) = 0.93, p = .4 | χ2 = 1.12, p = .3 |
| Years of heavy drinking c | 12.8 (SD = 7.5) | 17.9 (SD = 13.5) | t(17.7) = 1.39, p = .2 d | χ2 = 1.66, p = .2 |
| ASI-lite Alcohol Composite c | 0.52 (SD = 0.19) | 0.49 (SD = 0.17) | t(34) = 0.51, p = .6 | χ2 = 0.99, p = .3 |
| Heavy drinking days self-reported in Monitoring phase | 4.3 (SD = 1.5) | 4.8 (SD = 1.9) | t(49) = 1.02, p = .3 | χ2 = 0.92, p = .3 |
| $1000 Delay Discounting Log(ED50) | 2.14 (SD = 0.77) | 1.42 (SD = 0.68) | t(49) = 3.13, p = .003 | χ2 = 1.84, p = .2 |
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.
d
Levene’s test for equality of variances failed, unequal variances assumed in t test.