. Author manuscript; available in PMC: 2019 Apr 1.

Published in final edited form as: Brain Imaging Behav. 2018 Apr;12(2):564–576. doi: 10.1007/s11682-017-9723-x

Table 1.

Demographics by group. Controls reported infrequent/no use of marijuana and alcohol. MJ only reported frequent marijuana use, but infrequent/no alcohol use. Alc only reported frequent alcohol use, but infrequent/no use of marijuana. Finally, the MJ + Alc group reported frequent use of both alcohol+marijuana.

	Control	MJ only	Alc only	MJ + Alc
N	37	39	23	90
Proportion male	.54^d	.72^d	.61^d	.88^a,^b,^c
Age	16.05 (1.18)	15.97 (1.06)	16.35 (1.11)	16.31 (1.09)
Adjusted Pumps	5.56 (.60)	5.49 (.60)	5.39 (.53)	5.68 (.60)
Proportion Explosions	.20 (.10)	.18 (.11)	.18 (.08)	.20 (.10)
Total drinking days (out of 30; from TLFB)	.11 (.31)^c,^d	.23 (.43)^c,^d	3.22 (3.63)^a,^b	4.98 (5.17)^a,^b
Average drinks per drinking day (TLFB)	0.62 (2.85)^c,^d	1.08 (2.39)^c,^d	4.66 (4.03)^a,^b	6.99 (5.06)^a,^b
Total MJ days (out of 30; from TLFB)	0.05 (.23)^b,^d	14.64 (12.49)^a,^c	.09 (.29)^b,^d	16.74 (11.95)^a,^c
Alcohol use frequency (Never=0 to Every day=8)	.32 (.48) ^c,^d	.49 (.51) ^c,^d	3.39 (1.85) ^a,^b	3.92 (2.35) ^a,^b
MJ use frequency (Never=0 to Every day=8)	.21 (.42)^b,^d	4.69 (3.46)^a,^c	.13 (.34)^b,^d	5.76 (3.00)^a,^c
Hard drug use (last 3 months); possible range 0 to 8	.24 (.76)^d	.56 (.99)^d	.52 (.95)^d	1.27 (1.47)^a,^b,^c
Hard drug use (ever); possible range 0 to 9	1.16 (1.85)^d	1.74 (1.71)^d	2.22 (2.11)	2.83 (2.02)^a,^b
Proportion smoked cigarette in last month	.41^d	.62	.57	.69^a
IMPSS	9.46 (3.53)^d	9.92 (4.30)^d	11.09 (4.21)	11.87 (3.47)^a,^b
CASS-S	22.59 (12.04)^d	26.18 (16.03)^d	27.91 (9.56)	32.66 (14.97)^a,^b
CBCL	15.00 (9.79)^b,^d	23.46 (16.35)^a	19.70 (12.04)	24.54 (11.99)^a
CDI	2.59 (3.29)	3.59 (3.75)	3.17 (3.41)	2.83 (2.76)
RCMAS	48.38 (12.95)	49.26 (13.23)	49.04 (10.50)	49.26 (12.18)

Superscripts show significant group differences of the respective cell and other groups that differ (where a = Control; b = MJ only; c = Alc only; d = MJ + Alc).