TABLE 4.

Electroretinogram (ERG) parameters of participants.

Variation of cannabis use between week 0 (W0) and week 8 (W8)
	Cannabis users with decreased use (n = 20)	Cannabis users with enhanced use (n = 3)	Cannabis users with stationary use (n = 3)	P-values
N95 peak time at W8 (ms)	91.6 ms (85.6:97.6)	99.4 ms (87.6:–)	104.0 ms (99.4:–)	0.026
Light-adapted 3.0 b-wave peak time at W8 (ms)	32.6 ms (30.5:35.9)	36.3 ms (30.0:–)	37.2 ms (37.2:–)	0.017
Oscillatory potential 2 amplitude at W8 (μV)	32.3 μV (23.2:38.8)	38.2 μV (34.3:–)	37.1 μV (31.8:–)	0.267
Oscillatory potential 3 amplitude at W8 (μV)	−26.4 μV (−37.8:−23.1)	−34.8 μV (−47.5:–)	−33.2 μV (−39.5:–)	0.256
Variation of cannabis use between week 8 (W8) and week 12 (W12)
	Cannabis users with decreased use (n = 7)	Cannabis users with enhanced use (n = 13)	Cannabis users with stationary use (n = 3)	P-values
N95 peak time at W12 (ms)	97.8 ms (86.3:109.0)	95.6 ms (90.9:104.6)	102.7 ms (85.4:–)	0.996
Light-adapted 3.0 b-wave peak time at W12 (ms)	35.4 ms (30.5:36.3)	32.2 ms (30.5:36.8)	30.5 ms (29.6:–)	0.249
Oscillatory potential 2 amplitude at W12 (μV)	45.0 μV (38.9:63.3)	30.7 μV (26.3:36.4)	36.1 μV (28.7:–)	0.016
Oscillatory potential 3 amplitude at W12 (μV)	−45.6 μV (−60.4:−40.6)	−30.3 μV (−42.7:−25.4)	−30.2 μV (−40.8:–)	0.028
Variation of cannabis use between week 0 (W0) and week 12 (W12)
	Cannabis users with decreased use (n = 19)	Cannabis users with enhanced use (n = 6)	Cannabis users with stationary use (n = 0)	P-values
N95 peak time at W12 (ms)	91.1 ms (86.3:105.1)	101.7 ms (95.2:107.3)	–	0.121
Light-adapted 3.0 b-wave peak time at W12 (ms)	32.2 ms (30.5:36.3)	33.6 ms (29.4:37.7)	–	0.877
Oscillatory potential 2 amplitude at W12 (μV)	36.0 μV (30.5:48.0)	40.0 μV (26.3:47.3)	–	1.0
Oscillatory potential 3 amplitude at W12 (μV)	−40.6 μV (–46.9:–28.9)	−38.3 μV (−52.1:–26.3)	–	1.0

Mann-Whitney U test or Kruskal-Wallis test (one-way ANOVA on ranks) with Post-hoc comparison (Dunn’s post-hoc test).