Table 1.

Demographic and Clinical Characteristics

Characteristics	Schizophrenia Probands (n = 54)			Family Members (n = 22)			Control Group (n = 45)
	Mean	SD	% (N)	Mean	SD	% (N)	Mean	SD	% (N)
Age (years)	40.69	8.89		45.68	16.00		40.89	13.03
Sex
Males			57.4 (31)			40.9 (9)			55.6 (25)
Females			42.6 (23)			59.1 (13)			44.4 (20)
Ethnicity
Caucasian			27.8 (15)			40.9 (9)			51.1 (23)
African-American			68.5 (37)			59.1 (13)			42.2 (19)
Latino-American			1.9 (1)			0 (0)			4.4 (2)
Asian-American			1.9 (1)			0 (0)			2.2 (1)
Education level* (years)	12.57	2.08		12.95	2.26		14.04	2.66
Mother’s education (years)	12.19	2.60		11.47	2.94		13.32	2.03
Father’s education (years)	12.15	3.76		11.71	4.36		12.69	2.76
Pack-days*	0.34	0.48		0.30	0.41		0.09	0.20
Illness duration (years)	16.89	9.50
Age of onset (years)	22.76	7.71
BPRS23 total score	29.42	8.01
SANS24 total score	26.98	15.78
SAPS25 total score	21.62	15.77
HAM-D26 total score	6.22	6.88
Chlorpromazine equivalents	353.79	491.13

Note: BPRS, Brief Psychiatric Rating Scale; SANS, Scale for the Assessment of Negative Symptoms; SAPS, Scale for the Assessment of Positive Symptoms; HAM-D, Hamilton Psychiatric Rating Scale for Depression.

*Significant group difference (P = .01).