Table 1.

Clinical and biological characteristics of schizophrenic and healthy control subjects

Characteristics	Healthy control subjects (HC, n = 77)	Schizophrenic patients (SCZ, n = 77)
Males/Females (n)	49/28	49/28
Age (years ± SEM)	41.8 ± 1.4	40.9 ± 1.3a
Serum IL-18 (pg/ml ± SEM)	382 ± 16.5	518.2 ± 22.1b
Serum IL-18BP (ng/ml ± SEM)	4.9 ± 0.2	9.8 ± 0.4b
Serum free IL-18 (pg/ml ± SEM)	239.3 ± 9.8	253.6 ± 12.1a
Disease onset age (years ± SEM)	-	25.4 ± 1.1
Duration of illness (years ± SEM)	-	14.9 ± 1.6
Olanzapine equivalents (mg/day ± SEM)	-	22.3 ± 5.5

^adifference is not significant versus HC;^bP <0.0001 versus HC.