Table 2.
Change in post-use minus pre-use (baseline) performance assessment by user group, adjusted for age and gender
| No current use (post-pre) Mean (95% CI) |
Occasional use (post-pre) Mean (95% CI) |
Daily use (post-pre) Mean (95% CI) |
Overall p (ANOVA) | No-use vs. occ p |
No-use vs. daily p |
Occ. vs. daily p |
|
|---|---|---|---|---|---|---|---|
| Task 1: Reaction time | |||||||
| 1a: Simple reaction time (msec) | -9.86 (-29.85, 10.12) | 27.68 (3.86, 51.49) | -3.28 (-23.6, 17.05) | 0.03 | 0.02 | 0.65 | 0.05 |
| 1b: Choice reaction time (msec) | -28.15 (-46.79,-9.5) | 9.41 (-12.8, 31.62) | -10.49 (-29.45, 8.47) | 0.03 | 0.01 | 0.19 | 0.18 |
| 1c: Combined reaction time (msec) | -20.76 (-34.22,-7.3) | 17.15 (1.11, 33.18) | -6.75 (-20.44, 6.94) | .001 | < .001 | .15 | .03 |
| Task 2: Gap acceptance | |||||||
| 2a: Premature starts ratio (number of premature starts divided by total trials) | 0.02 (-0.01, 0.04) | -0.02 (-0.05, 0.01) | 0 (-0.03, 0.02) | .10 | .05 | .34 | .27 |
| 2b: Total time to complete trials (seconds) | -3.67 (-7.04,-0.29) | -1.30 (-5.18, 2.58) | 4.61 (1.24, 7.98) | .001 | .37 | < .001 | .03 |
| 2c: Success ratio (number of successful trials divided by total trials) | 0.01 (-0.04, 0.06) | 0.05 (-0.01, 0.11) | 0.1 (0.05, 0.15) | .05 | .29 | .01 | .19 |
| Task 3: Memory | |||||||
| 3a: Total number of correctly replicated shapes | 0.97 (0, 1.95) | -1.39 (-2.51,-0.27) | 0.66 (-0.31, 1.63) | .004 | .002 | .65 | .008 |
| 3b: Total time to complete shapes from memory (seconds) | -10.6 (-15.44,-5.76) | -4.38 (-9.93, 1.18) | -6.72 (-11.56,-1.89) | .20 | .19 | .30 | .50 |
msec milliseconds, occ occasional
Post-minus pre-performance assesses change after acute use of cannabis for occasional and daily users. For non-users, it represents the change in performance in two consecutive sessions separated by an interval of relaxation. Bolded comparisons were statistically significant (p < 0.05)