TABLE 3.
Means (SD) of cognitive tests for subjects with and without cannabis use disorder (CUD)
| Domain | Test | Non‐CUD | CUD | Cohen's d | p | BF |
|---|---|---|---|---|---|---|
| General cognitive ability | g | 0.12 (1.03) | −0.31 (0.83) | −0.44 | .003 a | 3.71 |
| Verbal and semantic fluency | COWAT, animal | 0.02 (1.00) | −0.06 (1.01) | −0.09 | .591 | 0.13 |
| COWAT, F‐A‐S | 0.04 (1.00) | −0.10 (1.00) | −0.14 | .404 | 0.17 | |
| Verbal intelligence | WTAR | 0.15 (1.05) | −0.42 (0.71) | −0.59 | <.0001 | 37.91 |
| Vocabulary | 0.14 (1.04) | −0.36 (0.78) | −0.51 | .0004 | 11.72 | |
| Verbal memory | CVLT, sum correct | 0.20 (0.98) | −0.55 (0.83) | −0.80 | <.0001 b | 3,216.71 |
| CVLT, recall | 0.11 (0.99) | −0.31 (0.97) | −0.43 | .009 a | 3.26 | |
| CVLT, recognition | −0.02 (1.08) | 0.05 (0.74) | 0.07 | .616 | 0.12 | |
| Spatial memory | Corsi | 0.06 (0.99) | −0.16 (1.02) | −0.22 | .216 | 0.30 |
| SCAP | 0.03 (1.00) | −0.08 (1.00) | −0.11 | .481 | 0.15 | |
| Emotional memory | Emotion recognition | 0.00 (0.94) | −0.01 (1.17) | −0.02 | .920 | 0.11 |
| Facial memory | Face memory | 0.02 (1.03) | −0.06 (0.93) | −0.08 | .615 | 0.12 |
| Working memory | Forward | 0.05 (0.99) | −0.15 (1.02) | −0.20 | .226 | 0.27 |
| Backward | 0.08 (1.02) | −0.21 (0.94) | −0.29 | .069 | 0.61 | |
| Letter‐number | 0.10 (1.03) | −0.28 (0.87) | −0.39 | .011 a | 1.89 | |
| Sustained attention | IPCPTs | 0.05 (1.00) | −0.14 (0.99) | −0.19 | .251 | 0.25 |
| Abstract reasoning | Matrix reasoning | 0.07 (1.05) | −0.18 (0.82) | −0.24 | .095 | 0.39 |
| Motor speed | Orientation time | 0.12 (1.01) | −0.32 (0.91) | −0.44 | .005 a | 3.67 |
| Processing speed | Digit symbol coding | 0.05 (0.99) | −0.13 (1.02) | −0.17 | .296 | 0.22 |
| Processing speed & executive function | Trail making A | −0.02 (1.02) | 0.06 (0.96) | 0.08 | .627 | 0.12 |
| Trail making B | −0.05 (0.99) | 0.12 (1.01) | 0.17 | .301 | 0.22 |
Note: Values are standardized residuals. Bold indicates significant at p < .05, FDR corrected.
Abbreviations: BF, Bayes factor; COWAT, controlled oral word association test; CVLT, California verbal learning test; IPCPT, identical pairs continuous performance test; SCAP, spatial capacity delayed response test; WTAR, Wechsler adult reading test.
a
Significant at p < .05 (uncorrected) after controlling for lifetime substance abuse/dependence other than cannabis. The other tasks remain significant at p < .05 FDR corrected.
b
Significant at p < .05 (FDR corrected) after controlling for education. The other tasks are no longer significant.