Table 2.

Results of Neurocognitive Assessment by Using CANTAB for Ultra-High Risk for Schizophrenia (UHR) vs. Familial High-Risk for Schizophrenia (FHR) Individuals

Test	Variables	UHR (N = 40) Mean ± SD	FHR (N = 34) Mean ± SD	t	P-Value
Spatial Span
	Span length	4.9 ± 1.12	6.03 ± 1.29	4.018	< 0.001
	Mean time to first response	3181.35 ± 637.41	3099.91 ± 529.33	-0.591	0.556
	Mean time to last response	4001.42 ± 728.21	3982.55 ± 630.05	-0.118	0.906
	Total errors	13.18 ± 5.47	13.62 ± 5.71	0.340	0.735
	Total usage errors	1.85 ± 1.64	1.82 ± 1.54	-0.071	0.944
Stocking of Cambridge
	Mean initial thinking time: 2-moves	1344.24 ± 1287.44	1032.98 ± 1036.67	-1.121	0.266
	Mean initial thinking time: 3-moves	3203.03 ± 2563.85	2022.17 ± 1600.50	-2.370	0.021
	Mean initial thinking time: 4-moves	2879.36 ± 1831.34	193.20 ± 1232.34	-2.592	0.012
	Mean initial thinking time: 5-moves	2881.67 ± 2178.36	2824.22 ± 3085.24	-0.092	0.927
	Mean subsequent thinking time: 2-moves	468.21 ± 640.37	86.39 ± 232.93	-3.431	0.001
	Mean subsequent thinking time: 3-moves	484.58 ± 805.46	93.07 ± 339.96	-2.736	0.009
	Mean subsequent thinking time: 4-moves	1516.90 ± 1616.06	598.04 ± 682.67	-3.232	0.002
	Mean subsequent thinking time: 5-moves	1475.33 ± 1634.57	541.25 ± 1213.51	-2.771	0.007
	Problems solved in minimum moves	6.02 ± 2.21	7.11 ± 1.17	2.706	0.009
Intra-Extra Dimension (IED)
	Completed stage errors	9.700 ± 5.482	9.176 ± 6.233	-0.489	0.626
	Completed stage trials	63.925 ± 20.520	66.205 ± 7.441	-0.654	0.516
	Stages completed	8.200 ± 2.344	8.882 ± 0.447	1.797	0.079
	Total errors	10.800 ± 6.131	10.911 ± 7.166	0.072	0.943
	Total trials	66.475 ± 19.144	69.147 ± 10.719	0.723	0.472

Abbreviations: CANTAB: The Cambridge Neuropsychological Test Automated Battery; UHR: Ultra-High Risk for Schizophrenia; FHR: Familial High-Risk for Schizophrenia.