Table 1. UHR and healthy controls did not differ in terms of age, gender, handedness, education, or parent education.

	UHR	Control	Total	P⩽
Age
Mean (s.d.)	18.57 (1.93)	17.85 (2.62)	18.16 (2.36)	NS
95% CI	17.91, 19.23	17.07, 18.62	17.62, 18.68
Gender
Male	22	23	45
Female	13	23	36
Total	35	46	81	NS
Dominant hand
Right	31	42	73
Left	4	4	8	NS
Education (years)
Mean (s.d.)	12.23 (2.00)	11.79 (2.59)	11.98 (2.35)	NS
95% CI	11.53, 12.94	11.03, 12.56	11.46, 12.51
Parent education
Mean (s.d.)	15.93 (2.17)	15.26 (3.39)	15.54 (2.94)	NS
95% CI	15.17, 16.68	14.25, 16.26	14.89, 16.20
Positive symptoms
Mean (s.d.)	11.64 (4.23)	0.53 (1.35)	5.90 (6.38)	0.001
95% CI	10.41, 13.42	0.27, 1.16	4.15, 6.96
Negative symptoms
Mean (s.d.)	11.11 (6.62)	0.57 (0.94)	5.65 (7.03)	0.001
95% CI	7.49, 12.16	0.17, 0.66	3.05, 5.91
Velocity scaling (VS)
Mean (s.d.)	−0.12 (4.07)	2.31 (4.10)	1.26 (4.24)	0.01
95% CI	−1.52, 1.28	1.09, 3.52	0.32, 2.19

Abbreviations: NS, not significant; UHR, ultrahigh risk.

UHR participants were rated significantly higher on both positive and negative symptom domains. UHR individuals show significantly lower velocity scaling than healthy controls, indicating the presence of spontaneous parkinsonisms. 95% Confidence interval (CI) expressed as lower bound, upper bound.