Table 2.

Demographic Characteristics and Psychiatric Symptoms in Individuals at Ultra High-Risk for Psychosis, in Individuals With First-Episode Schizophrenia, and Healthy Controls

Variable	Ultra High-Risk Subjectsa (N = 79)			First-Episode Schizophrenia Subjects (N = 30)			Healthy Control Subjects (N = 30)			Analysesb
	N	%		N	%		N	%		χ2	df	P
Demographic characteristics
Male	26	32.9		18	60.0		15	50.0		7.43	2	0.02
Education										0.40	2	0.82
Basic	37	46.8		16	53.3		14	46.7
Higher	42	53.2		14	46.7		16	53.3
	Mean	SD	95% CI	Mean	SD	95% CI	Mean	SD	95% CI	F	df	P
Age	16.5	2.1	16–17	16.8	1.41	16–17	15.6	2.01	15–16	2.87	2, 136	0.06
Current IQ	99.3	15.6	96–103	90.8	10.0	87–95	104.4	11.1	100–109	7.64	2, 136	0.001
Symptoms
PANSS scores
Positive symptom score	14.5	3.1		12.4	4.1		7.2	0.9		60.3	2, 136	<0.001
Negative symptom score	14.0	5.8		16.2	4.7		7.1	0.4		29.3	2, 136	<0.001
Global symptom score	30.2	7.0		28.5	5.5		16.9	2.6		55.5	2, 136	<0.001
Total symptom score	58.7	13.4		57.0	12.4		31.2	3.7		62.0	2, 136	<0.001

Note:

^aAssessment of ultra high-risk subjects was based on state plus trait risk factors, attenuated symptoms, and/or brief limited intermittent psychotic symptoms.

^bOne-way ANOVA or chi-square analysis for categorical data.