Table 2.

Neuropsychological Performance for Patients with Schizophrenia Spectrum Disorder and Healthy Controls

Variable	Patients			Controls			Analysis
	N	Mean	S.D.	N	Mean	S.D.	t	P<
Intellectual abilities
WAIS-III Digit Span	65	9.0	2.9	51	11.5	2.9	4.57	0.0001
WAIS-III Digit Symbol	70	7.0	2.6	53	11.5	3.1	8.82	0.0001
Executive functions
WCST, categories	69	4.6	2.0	52	5.4	1.4	2.58	0.01
WCST, perseverative errors	69	16.0	12.0	52	11.2	9.6	2.39	0.02
Verbal memory
CVLT-II, trials 1–5	69	43.1	12.7	54	58.6	7.3	8.52	0.0001
CVLT-II, short delayed recall	69	8.6	3.5	54	12.6	2.3	7.55	0.0001
CVLT-II, 20’ delayed recall	69	9.1	3.7	54	13.0	2.1	7.42	0.0001
Psychomotor speed: Thumb
Finger Sequencing
Right hand	69	8.3	1.9	44	9.8	1.5	4.16	0.0001
Left hand	69	8.1	2.0	44	9.2	1.6	3.18	0.002
Expressive language
Sentence Comprehension	69	10.3	1.9	44	11.4	0.8	4.35	0.0001
Attention/Concentration: CPT
Simple Reaction Time, Accuracy	63	28.5	3.2	47	29.1	1.4	1.28	0.20
Simple Reaction Time, RT	63	348.8	94.7	47	300.6	76.0	2.87	0.005
Vigilance, Accuracy	63	26.8	5.5	47	29.0	2.3	2.78	0.007
Vigilance, RT	63	438.0	91.8	47	378.8	71.4	3.66	0.0004
Distractibility, Accuracy	59	20.3	11.6	47	27.4	2.7	4.56	0.0001
Distractibility, RT	59	474.0	90.8	47	403.9	67.1	4.56	0.0001

Abbreviations: WAIS-III, Wechsler Adult Intelligence Scale, Third Edition; WCST, Wisconsin Card Sorting Test; CVLT-II, California Verbal Learning Test, Second edition; RT, Reaction Time (in milliseconds), CPT, Continuous Performance Test.