Table 1.

Group Characteristics

	Ketamine Users	Schizophrenia	Polydrug-Using Control	Non-Drug-Using Control	F(3,73)	p
	(n = 20)	(n = 20)	(n = 17)	(n = 20)
Age at Testing (range)	28.2 (20–42)	24.8 (17–48)	26.47 (18–30)	30.8 (21–51)	2.64	.06
NART IQ (range)	114.25 (93–126)	111.05 (105–120)	110.2 (92–122)	112.3 (105–121)	1.04	.38
Age Left Education (range)	18.85 (16–21)	17.7 (15–21)	17.94 (16–21)	18.5 (16–21)	1.36	.20
Sex (male/female)	15/5	14/6	17/0	11/9	9.91a	.02
Smokers (n)	12	14	8	Not recorded	4.25a	.119
Alcohol Users (n)	20	18	20	Not recorded	2.03a	.362

NART, National Adult Reading Test.

^aχ² statistic.