Table 2.
Hierarchical Moderated Regression Models for Predicting How Age of Initiated Cannabis Use and Sex Affect Neuropsychological Functioning
| Variable | Age of 1st Use | Age of Regular Use | ||||
|---|---|---|---|---|---|---|
| R2 | B | p | R2 | β | p | |
| HVLT (Immediate Recall) | ||||||
|
| ||||||
| Block 1-Age of Onset | 0.01 | 0.08 | .53 | 0.05 | 0.22 | .07 |
| Block 2-Age of Onset | 0.13 | −0.02 | .91 | 0.14 | 0.11 | .36 |
| Sex | -- | −0.03 | .83 | -- | −0.03 | .81 |
| Amount of Lifetime Cannabis Use | -- | −0.37 | .004 | -- | −0.32 | .01 |
| Block 3-Age of Onset x Sex | 0.22 | 0.38 | .01 | 0.22 | 0.38 | .01 |
|
| ||||||
| HVLT (Delayed Recall) | ||||||
|
| ||||||
| Block 1-Age of Onset | 0.01 | 0.10 | .43 | 0.05 | 0.23 | .06 |
| Block 2-Age of Onset | 0.19 | −0.01 | .92 | 0.22 | 0.09 | .44 |
| Sex | -- | −0.05 | .65 | -- | −0.08 | .49 |
| Amount of Lifetime Cannabis Use | -- | −0.44 | .001 | -- | −0.44 | .001 |
| Block 3-Age of Onset x Sex | 0.25 | 0.32 | .03 | 0.26 | 0.25 | .09 |
|
| ||||||
| IGT (Net Total) | ||||||
|
| ||||||
| Block 1-Age of Onset | 0.03 | −0.16 | .19 | 0.01 | −0.10 | .41 |
| Block 2-Age of Onset | 0.16 | −0.26 | .04 | 0.14 | −0.23 | .07 |
| Sex | -- | −0.02 | .88 | -- | 0.00 | .99 |
| Amount of Lifetime Cannabis Use | -- | −0.38 | .002 | -- | −0.38 | .003 |
| Block 3-Age of Onset x Sex | 0.16 | −0.05 | .76 | 0.17 | −0.23 | .14 |
Note. The sex variable was dummy coded, with males serving as the referent group; covariates were only included in models in which they were significant; HVLT, Hopkins Verbal Learning Task; IGT, Iowa Gambling Task; n/a, non-applicable; bold and italicized p-values are significant or trending toward significance.