Table 1.

Sample characteristics for healthy comparison (HC), schizophrenia (SZ), and firstdegree relative (RL) groups. Mean (±standard deviation).

	HC (N=30)	SZ (N=67)	RL (N=30)
Variable
Age (years)	39.3 (15.7)	37.0 (11.1)	42.2 (20.1)
Sex (male/female)	18/12	49/18	15/15
Race (Caucasian/African-American/Other	17/10/3	19/47/1	12/18/0*
Smoking (pack-years)	1.8 (5.9)	14.1 (22.0)	7.8 (11.5)**
Education (years)	14.6 (2.5)	12.2 (2.0)	12.3 (2.4)**
Duration of Illness (years)		13.9 (9.4)
Age of Onset of Illness (years)		22.2 (7.5)
Deficit/Non-Deficit		8/36
BPRS (total)		31.0 (8.7)
SANS (total)		32.4 (17.9)
SAPS (total)		22.8 (20.6)

Note. Duration of illness = difference in years between date of diagnosis and psychophysical assessment; BPRS = Brief Psychiatric Rating Scale; SANS = Scale for the Assessment of Negative Symptoms; SAPS = Scale for the Assessment of Positive Symptoms.

^*p=.004

^**p<.001