Table 3.

Unweighted descriptive statistics for the independent variables and for VBR in schizophrenics and controls by diagnostic group

	Schizophrenics			Controls
	Mean	SD	n	Mean	SD	n
Age	31.79	9.57	72	32.11	8.92	72
Age at Onset of Illness	25.25	12.2	43	-	-	-
Duration of Illness	8.04	4.09	43	-	-	-
Percentage of males in sample	0.69	0.21	60	0.64	0.23	55
Year of Study	1990.46	6.37	72	-	-	-
Mean VBR by diagnostic group
DSM–III	6.83	1.96	27	4.94	2.0	27
DSM-III-R	6.66	2.5	19	5.06	2.26	19
DSM–IV	3.14	3.48	4	2.32	2.51	4
RDC	6.45	2.14	8	5.65	2.77	8
Multiple Criteria Used	6.32	1.75	11	4.92	1.73	11
None Given	4.25	3.76	3	1.87	1.74	3