Table 1. Demographic data.

	Non-user controls	Chronic cannabis users	Significance level
N (M:F)	25 (13∶12)	25 (19∶6)	n.s.
Age (years)	21.7 (3.8)	23.9 (4.4)	n.s.
Race	23 C : 2 T	23 C : 2 T	n.s.
Raven IQ	124.4 (5.6)	124.2 (7.6)	n.s.
Alcohol use	3.1 (2.4)	3.9 (2.8)	n.s.
Nicotine use	4 S : 21 NS	21 S : 4 NS	**

Standard deviation in parentheses; n.s.: non-significant difference; Race: C – Caucasian, T – Turkish; Raven IQ: measured by Raven's Standard Progressive Matrices; Alcohol use: consumption of units per week; Nicotine use: S – smoker, NS – non-smoker.

**p<.01.