Skip to main content
. Author manuscript; available in PMC: 2010 Nov 16.
Published in final edited form as: Am J Med Genet. 2002 Apr 8;114(3):299–303. doi: 10.1002/ajmg.1701

TABLE IV.

Demographics and Intelligence in Familial and Sporadic Schizophrenia Cases

Familial patients (n = 35) Sporadic patients (n = 68)
Age (years) 31.5 ± 10.5 32.2 ± 10.0 t=0.37, df=101, P=0.715
Sex (male;female) 24:11 45:23 Chi-square=0.06, df=1, P=0.81
Socioeconomic status 26.8 ± 12.0 37.5 ± 11.1 t=3.22, df=47, P=0.002
Education, years 11.8 ± 3.0 13.7 ± 4.8 t=2.08, df=93, P=0.041
Age of onset, years 21.1 ± 7.2 19.5 ± 5.1 t=1.28, df=97, P=0.204
Full-scale IQ 81.7 ± 11.5 89.8 ± 13.5 t=2.31, df=51, P=0.025
Verbal IQ 84.0 ± 12.0 94.2 ± 15.0 t=2.65, df=51, P=0.011
Performance IQ 79.9 ± 11.8 85.5 ± 12.5 t=1.67, df=51, P=0.10