Table 2:
Correlation between UFOV driving-related performance and perceived driving ability and safety (n = 45)
| Timing and perception | VAS measure; correlation coefficent | |
|---|---|---|
| UFOV-2 | UFOV-3 | |
| No cannabis use | ||
| Perceived driving ability | r = 0.13, p = 0.4 | r = 0.18, p = 0.2 |
| Perceived driving safety | r = 0.06, p = 0.7 | r = 0.18, p = 0.2 |
| At 1 h after cannabis use | ||
| Perceived driving ability | r = −0.12, p = 0.4 | r = −0.09, p = 0.5 |
| Perceived driving safety | r = −0.11, p = 0.4 | r = −0.12, p = 0.4 |
| At 3 h after cannabis use | ||
| Perceived driving ability | r = 0.08, p = 0.6 | r = −0.006, p > 0.9 |
| Perceived driving safety | r = 0.11, p = 0.5 | r = 0.02, p = 0.8 |
| At 5 h after cannabis use | ||
| Perceived driving ability | r = −0.40, p = 0.006 | r = −0.005, p > 0.9 |
| Perceived driving safety | r = −0.38, p = 0.009 | r = −0.05, p = 0.7 |
Note: r = Pearson correlation coefficient, UFOV = useful field of view, UFOV-2 = complex divided-attention task, UFOV-3 = complex selective-attention task with distractions, VAS = visual analogue scale.