. Author manuscript; available in PMC: 2016 Jul 1.

Published in final edited form as: Acta Psychiatr Scand. 2015 Jan 9;132(1):60–68. doi: 10.1111/acps.12382

Table 2.

Demographic characteristics comparing high-risk subjects based on level of lifetime cannabis use

	No cannabis use	Cannabis use w/o impairment	Cannabis abuse	Cannabis dependence
	(N = 211)	(N = 63)	(N = 45)	(N = 22)	Statistic	P	Post hoc comparisons
Age At baseline – Mean (SD)	17.16 (4.49)	19.77 (4.28)	19.87 (5.08)	21.82 (4.63)	F(3,340) = 12.83	<0.001	NU < CU, CA, CD
Gender – % Male	59.2%	60.3%	73.3%	63.6%	χ² = 3.20	0.362	–
Estimated IQ – Mean (SD)^*	103.20 (16.43)	113.20 (16.88)	107.00 (15.14)	106.00 (20.76)	F(3,243) = 4.14	0.007	NU < CU
Parental education – % > High school^†	83.2%	71.4%	85.3%%	52.6%	χ² = 12.51	0.006	CD < CA, NU
Race – % Caucasian	74.4%	81%	86.7%	72.7%	χ² = 3.97	0.265	–

NU, no cannabis use; CU, cannabis use without impairment; CA, cannabis abuse; CD, cannabis dependence.

Estimated IQ: Total N = 244.

^†

Parental education: Total N = 276.