Table 3.
Demographic data and mean differences between conditions (baseline-smoking cannabis) for each visual parameter for the two groups classified according their subjective perception of how cannabis affects their vision.
| Group 1 (N = 10) (mean (SD)) |
Group 2 (N = 21) (mean (SD)) |
t/z | p value | |
|---|---|---|---|---|
| Demographic data | ||||
| Sex (n, (%))a |
Male 6 (19.35%) Female 4 (12.90%) |
Male 15 (48.39%) Female 6 (19.35%) |
− 0.626 | 0.53 |
| Age (years) | 21.20 (1.03) | 24.48 (5.94) | 2.452 | 0.022 |
| Monthly use (number of days) | 13.75 (9.81) | 8.92 (10.96) | − 1.185 | 0.25 |
| Duration of use (years)a | 4.20 (2.53) | 6.57 (5.65) | − 1.381 | 0.173 |
| Age when started use (years) | 17.00 (2.00) | 17.10 (1.92) | 0.127 | 0.900 |
| AUDIT score | 6.30 (2.45) | 7.52 (3.92) | 0.902 | 0.37 |
| CUDIT-r score | 9.90 (3.75) | 8.33 (6.25) | 0.395 | 0.40 |
| Mean differences between conditions | ||||
| Visual acuityb (logMAR) | − 0.05 (0.03) | − 0.05 (0.05) | − 0.405 | 0.69 |
| Contrast sensitivityc | 4.23 (13.22) | 17.07 (16.13) | 2.186 | 0.029 |
| Stereoacuity (far)b (arcsec) | − 94.00 (85.53) | − 115.00 (96.21) | − 0.584 | 0.56 |
| Stereoacuity (near)b (arcsec) | − 9.78 (20.11) | − 12.74 (25.96) | − 0.304 | 0.76 |
| VDIb | − 0.01 (0.04) | − 0.03 (0.05) | − 1.150 | 0.26 |
| Log(s)b | − 0.11 (0.13) | − 0.09 (0.12) | 0.417 | 0.68 |
| Accommodative response (lag) (40 cm)c (D) | 0.47 (0.49) | 0.13 (0.36) | − 2.006 | 0.056 |
| Accommodative response (lag) (20 cm)c (D) | 0.49 (0.56) | 0.43 (0.62) | − 0.263 | 0.80 |
aMann–Whitney U test.
bNegative value indicates worsening after smoking cannabis.
cPositive value indicates worsening after smoking cannabis.