Table 5.
Pre-and Post-initiation Difference Scores by Group
| Cognitive Measure | Post minus Pre-Initiation | Group Differences | |||
|---|---|---|---|---|---|
|
| |||||
| Infrequent Cannabis Users (IF) | Moderately Frequent Cannabis users (MF) | Alcohol-Only Users (AO) | Post-Initiation minus Pre-Initiation Controlling for Pre-Initiation Performance | Nature of Significant group differences | |
|
| |||||
| n= | 29 | 18 | 39 | -- | -- |
| RAVLT | F (p)/ η p 2 | ||||
|
| |||||
| Sum Total Correct: Trials 1–5 | 3.34 (1.5) | −2.81 (1.9) | −0.56 (1.3) | 3.70/.029/.09 | MF < IF |
|
| |||||
| New Learning (Average: Trial 1, ListB) | 0.38 (.45) | −0.84 (.60) | 0.07 (.39) | 1.29/.281/.03 | -- |
| Immediate recall | 0.85 (.41) | −0.39 (.53) | 0.23 (.36) | 1.75 /.181/.04 | -- |
| 30-minute delayed recall | 0.74 (.40) | −1.25 (.52) | −0.06 (.35) | 4.55/.014/.10 | MF < IF |
| Proportion of consolidated information (Delayed recall/Total correct trial 5) | 0.02 (.33) | −0.11 (.04) | −0.00 (.03) | 3.05/.053/.07 | -- |
|
Iowa Gambling Task Total Adv-Disadv choices |
14.00 (5.8) | 6.23 (7.80) | 7.75 (5.2) | .50/.609/.013 | -- |
| Total Adv-Disadv choices for Trials 1–40: Decisions under ambiguity | 1.71 (18.98) | −0.94 (16.55) | −0.89 (17.54) | 0.28/.760/.01 | -- |
| Total Adv-Disadv choices for Trials 41–100: Decisions under risk | 12.80 (4.46) | 6.52 (5.98) | 8.86 (4.00) | 0.41/.668/.01 | -- |
Notes. Estimated marginal means and standard errors are presented, controlling for parental education and pre-initiation performance. Comparisons where p-values are statistically significant (p<.05) are bolded.