Table 1.

Demographics and Motion Parameters

	Non-PS n = 452	PS n = 129	P value
Age (SD)	15.2 (3.20)	15.00 (2.8)	n.s.
Sex (% female)	55.3	56.6	n.s.
Ethnicity (%)
AA	35.8	57.4	.001
EA	54.2	31.0
Other	10.0	11.6
WRAT (raw score)	54.36 (8.6)	51.21 (9.04)	<.05
Education (years)	8.83 (3.2)	8.46 (2.8)	n.s.
Maternal education (years)	14.4 (2.5)	13.8 (2.2)	<.05
PS-R (total score)	3.86 (5.6)	21.59 (13.8)	<.05
SOPS (total score of negative/disorganized symptoms)	1.33 (1.83)	3.98 (4)	<.05
K-SADS (severity of hallucinations/delusions)	0.55 (2.07)	4.9 (5.26)	<.05
Sum of endorsed depressive symptoms	1.34 (1.91)	2.2 (1.76)	<.05
Sum of endorsed manic symptoms	1.5 (2.92)	3.86 (2.97)	<.05
N meeting ADHD criteria (yes:no)*	8	11	<.05
Relative movement (mm)	0.59 (0.29)	0.65 (0.29)	<.05
Maximum movement (mm)	0.7 (0.59)	0.77 (0.57)	n.s.
Spike count	4.38 (5.3)	5.24 (5.6)	n.s.

Note: PS, psychosis spectrum youth; AA, African American; EA, European American; WRAT, wide range achievement test; PS-R, PRIME screen revised; SOPS, scale of prodromal symptoms; K-SADS, Kiddie schedule for affective disorders and schizophrenia; ADHD, attention-deficit/hyperactivity disorder *criteria according to Kessler et al.⁴²