Table 1.

Demographic and Clinical Characteristics of the Participants

	Control	Psychosis	ADHD	Results of Statistical Tests
N	57	42	36
M:F, N (%)	26:31 (46%:54%)	26:16 (62%:38%)	28:8 (78%:22%)	$X_2^2$, p = .008; C ≠ ADHD
Age in months (SD)	152 (30)	167 (41)	152 (31)	ns
Age range	105-226	101-238	106-224
Socioeconomic	53 (9)	40 (14)	50 (10)	F(2, 126) = 15.75, p < .001; (C = ADHD) >  Psychosis
status
(Hollingshead, 1975)
Estimated IQ (SD)	114 (13)	99 (15)	108 (13)	F(2, 122) = 14.87, p < .001; (C = ADHD) >  Psychosis
SANS/SAPS
Negative symptoms		2.7 (1.0)
Psychotic symptoms		1.9 (0.9)
Disorganized   symptoms		2.3 (1.3)
Medications, N (%)
Antipsychotic	0	28 (67%)	0
Psychostimulant	0	10 (24%)	23 (64%)
Antidepressant	0	10 (24%)	1 (3%)
Mood stabilizer	0	9 (21%)	0
Benzodiazepine	0	5 (12%)	1 (3%)
Anti-histamine	0	4 (10%)	0
Alpha-adrenergic	0	3 (7%)	2 (6%)
Ethnicity, N (%)				$X_6^2$, p = .044, pairwise comparisons  between groups ns
Caucasian	50 (88%)	28 (67%)	31 (86%)
African American	1 (2%)	4 (10%)	4 (11%)
Asian	1 (2%)	3 (7%)	0
Hispanic	0	0	0
Mixed/Other	5 (9%)	7 (17%)	1 (3%)

Note: ns = not significant. Medications taken by fewer than 5% of participants in the ADHD and psychosis groups are not reported.