Relationship between negative symptoms and neurocognitive functions in adolescent and adult patients with first-episode schizophrenia

Table 1 Demographic, neuropsychological assessments and clinical assessments outcomes of first-episode schizophrenics and healthy people

		First-episode schizophrenics (N = 92)	Healthy people (N = 57)	t/χ ²	P-value
Age (years)		22.86 ± 7.82	23.84 ± 8.69	-.697	.487
Education level (years)		10.77 ± 3.01	11.77 ± 3.38	-1.832	.070
Duration of illness (months)		12.26 ± 18.37	None	None	None
Gender (male/total)		36/92	24/57	.129	.625
PANSS	T	84.18 ± 16.71	None	None	None
	P	23.88 ± 7.37	None	None	None
	N	19.30 ± 8.12	None	None	None
	G	41.00 ± 8.32	None	None	None
WCST	TT	47.34 ± 2.73	47.04 ± 2.08	.763	.447
	CT	25.42 ± 10.47	33.91 ± 7.30	-5.821	< .001
	TE	21.80 ± 10.56	12.77 ± 8.18	5.846	< .001
	PE	13.82 ± 7.54	7.56 ± 4.99	6.089	< .001
	RE	7.96 ± 5.00	5.49 ± 3.94	3.342	.001
	CC	2.87 ± 2.06	4.68 ± 1.68	-5.872	< .001
CPT	CPT 1	11.01 ± 2.27	11.18 ± .80	-.635	.527
	CPT 2	11.63 ± 3.33	12.12 ± 1.65	-1.201	.232
	CPT 3	11.95 ± 2.99	12.23 ± 1.28	-.795	.428
	PE of CPT 3	.84 ± 1.75	.37 ± 1.08	2.022	.045
TMT	TMT 1	58.13 ± 34.06	43.56 ± 35.77	2.460	.015
TMT	TMT 2	114.31 ± 62.47	84.51 ± 64.39	2.777	.006
SCWT	SCWT 1	50.82 ± 15.19	44.96 ± 21.87	1.772	.080
	SCWT 2	90.16 ± 33.32	62.51 ± 17.90	6.574	< .001
	SCWT 3	143.27 ± 49.19	97.51 ± 22.82	7.687	< .001
	RT of SCWT	53.10 ± 29.27	35.00 ± 14.72	5.000	< .001

Values are the means ± SD. All P-values were compared with Healthy people analyzed by an unpaired t-test
T PANSS total scores, P positive syndrome scale scores, N negative syndrome scale scores, G general psychopathology syndrome scale scores, TT total trials, CT correct trials, TE total number of errors, PE perseverative errors, RE random errors, CC the number of completed categories, PE of CPT 3 perseverative errors of CPT 3, RT of SCWT reaction time of SCWT;

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