TABLE 1.

Participant Demographics, Symptoms, Role Functioning and Medial Temporal Lobe Volumes

	Healthy Control	Ultra High-Risk	Grand Total	Group Differences
Gender
Males	12(44%)	18(62%)	30(54%)	N.S.
Females	15(56%)	11(38%)	26(46%)
Total	27	29	56
Age
Mean Years (SD)	17.63(2.70)	18.52(1.90)	18.09(2.34)	N.S.
Parent Education
Mean Years (SD)	15.26(2.93)	14.07(4.86)	14.65(4.04)	N.S.
Symptoms
Positive
Mean (SD)	.93(1.54)	11.72(4.86)	6.52(6.54)	p ≤ 0.01
Negative
Mean (SD)	.81(1.39)	11.82(7.49)	6.52(7.77)	p ≤ 0.01
Avolition
Mean (SD)	.15(.60)	2.41(1.59)	1.32(1.66)	p ≤ 0.01
Occupational Functioning
Mean (SD)	.26(.59)	2.38(1.81)	1.36(1.73)	p ≤ 0.01
Total Physical Activity	458.17(222.76)	364.30(177.31)	409.10(203.51)	p = 0.06
Hippocampus
Right Mean % ICV (SD)	.28(.02)	.26(.02)	.27(.02)	p ≤ 0.01
Left Mean % ICV (SD)	.28(.03)	.26(.03)	.27(.03)	p ≤ 0.01
Parahippocampal Gyrus
Right Mean % ICV (SD)	.14(.02)	.13(.01)	.13(.02)	p ≤ 0.01
Left Mean % ICV (SD)	.15(.02)	.14(.02)	.14(.02)	p = 0.13

Note: not significant (N.S.); Positive and negative symptoms as well as Avolition and Occupational Functioning scales reflect total sums from domains from the Structured Interview for Prodromal Syndromes (SIPS); Global Role Functioning reflects scores on the Global Functioning Scale- Role (GFS-R); Brain volumes represent the respective structure divided by total intracranial volume. Brain volumes represent the respective structure divided by total intracranial volume.