Table 3.

Single-order associations of social withdrawal/aggression/odd behavior and demographic, syndrome and symptom features

	Social withdrawal/aggression/odd behavior
	Afrikaner probands (N=109)				US probands (N=109)
	No (n=76)		Yes (n=33)		No (n=65)		Yes (n=44)
	Mean	S.D.	Mean	S.D.	Mean	S.D.	Mean	S.D.
Demographics
Age at interview	31.50	8.58	29.64	8.28	31.34	8.20	29.86	7.94
No. of years of education	11.84	2.07	12.03	2.20	13.66	1.98	13.16	2.00
	%	(N)	%	(N)	%	(N)	%	(N)
% Female	26.32	(20)	33.33	(11)	30.77	(20)	25.00	(11)
Single (never married)	77.63	(59)	84.85	(28)	80.00	(52)	93.18	(41)
Left-handed	11.84	(9)	18.18	(6)	10.77	(7)	15.91	(7)
	(n=76)		(n=33)		(n=69)		(n=37)
Family hx of schizophrenia	30.26	(23)	33.33	(11)	33.33	(21)	37.21	(16)
Family hx of other psychia dx	65.79	(50)	75.76	(25)	61.90	(39)	60.46	(26)
Syndrome features	(n=76)		(n=33)		(n=65)		(n=44)
	Mean	S.D.	Mean	S.D.	Mean	S.D.	Mean	S.D.
Schizophrenia onset age	23.14	5.59	21.18	5.00	20.46	4.01	18.87	4.76
	%	(N)	%	(N)	%	(N)	%	(N)
Attempted suicide	26.32	(20)	30.30	(10)	55.38	(36)	43.18	(19)
Schizoaffective	25.00	(19)	24.24	(8)	47.69	(31)	50.00	(22)
Symptom history
Delusions	97.37	(74)	100	(33)	96.92	(63)	86.36	(38)*
Auditory hallucinations	68.42	(52)	75.76	(25)	60.00	(39)	65.91	(29)
Visual hallucinations	32.90	(25)	45.46	(15)	40.00	(26)	45.46	(20)
Sensory hallucinations	22.37	(17)	24.24	(8)	35.38	(23)	31.82	(14)
Disordered behavior	68.42	(52)	72.73	(24)	70.77	(46)	56.82	(25)
Thought disorder	77.63	(59)	75.76	(25)	44.62	(29)	59.09	(26)
Alogia/flat affect	67.10	(51)	78.79	(26)	73.85	(48)	75.00	(33)

^*Fisher’s exact test (2-tailed) P=0.05 or t-test P=0.05.

^**Fisher’s exact test (2-tailed) P=0.01 or t-test P=0.01.