Table 1.

Demographic characteristics of the examined clinical samples.

	FEP cases (N = 108)	SZ cases (N = 104)	p-value
Gender (males/females)	70/38	104/0	n/a
Age in years (mean ± SD)	25.5 ± 7.3	33.2 ± 8.6	<0.0001
Years of education (mean ± SD)	13.4 ± 2.6	12.4 ± 3.9	0.028
Age at onset (mean ± SD)	25.2 ± 7.3	22.6 ± 9.3	0.025
Parental SES (high/middle/low)	41/35/32	35/31/38	0.327
Positive FHP (%)	44.4	30.8	0.446

Abbreviations: FEP, first-episode psychosis; FHP, family history of psychosis; SES, socioeconomic status; SZ, schizophrenia.