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Table 1 Sociodemographic and neonatal characteristics and results of the neuropsychological assessment of the SZs and HCs

From: Aberrant cortical surface and cognition function in drug-naive first-episode schizophrenia

  SZs (n = 117) HCs (n = 98) Statistic
Mean ± SD Mean ± SD t/t'/X 2 p
Age (years) 24.73 ± 7.01 26.53 ± 7.05 t' = − 0.47 0.062
Gender (male/female) 86/31 58/40 X 2 = 0.32 0.030
Handedness (right/left) 115/0 98/0   
Years of education 13.18 ± 2.79 14.14 ± 2.31 t' = − 2.31 0.022
DUP (months) 15.77 ± 14.56 NA   
WAIS (IQ) 102.80 ± 11.69 116.67 ± 9.15 t'= − 8.17 0.000
Cognitive domains  
Speed of processing 33.52 ± 10.25 49.36 ± 9.74 t' =− 9.86 0.000
Attention/vigilance 36.12 ± 10.82 47.96 ± 7.36 t' = − 7.88 0.000
Working memory 34.12 ± 9.67 45.12 ± 7.12 t' = − 7.97 0.000
Verbal learning 35.16 ± 11.08 46.70 ± 9.77 t' = − 6.86 0.000
Visual learning 39.43 ± 11.86 50.73 ± 8.04 t'= − 6.87 0.000
Reasoning/problem solving 43.57 ± 10.69 54.45 ± 7.06 t' = − 7.39 0.000
Social cognition 32.69 ± 9.87 39.56 ± 9.16 t' = − 4.49 0.000
Executive function 36.30 ± 11.01 52.33 ± 8.50 t' = − 10.07 0.000
overall composite 28.55 ± 12.23 47.00 ± 7.53 t' = − 11.46 0.000
PANSS    
All totals 91.48 ± 7.88 NA   
Positive symptoms 16.16 ± 2.80 NA   
Negative symptoms 18.95 ± 3.20 NA   
General 46.13 ± 3.83 NA