Table 2

Comparison of Characteristics Surrounding the Homicides Between Predominantly Impulsive and Proactive Groups

	All Subjects (N = 47)		Predominant Impulsive (n = 27)		Predominant Proactive (n = 20)
	n	%	n	%	n	%	Test Statistics, p
Psychotically motivated homicide	44	93.6	24	88.9	20	100	χ² = 2.374; p = .251^{^a}
Multiple victims	5	10.6	3	11.1	2	10	χ² = . 015; p = 1.000^{^a}
Treatment nonadherence in the index homicide	42	89.4	24	88.9	18	90	χ² = . 015; p = 1.000^{^a}
Victim-perpetrator relationship							χ² = 8.096; p = .424
Parents	14	29.8	8	29.6	6	30
Intimate partner	5	10.6	1	3.7	4	20
Children	1	2.1	0	0	1	5
Siblings	6	12.8	4	14.8	2	10
Nonfamily acquaintance	17	36.1	11	40.8	6	30
Stranger	4	8.5	3	11.1	1	5
Method/weapon							χ² = 8.646; p = .029
Sharp instrument	32	68.1	21	77.8	11	55
Firearms^{^b}	7	14.9	1	3.7	6	30
Blunt	5	10.6	4	14.8	1	5.0
Strangulation	2	4.3	1	3.7	1	5
Pushing from a height	1	2.1	0	0	1	5
Place							χ² = 2.605; p = .107
Public place	18	38.3	13	48.1	5	25
Private property	29	61.7	14	51.9	15	75
Intoxicated offender							χ² = 1.897; p = .387
No	39	83	21	77.8	18	90
Alcohol	6	12.8	4	14.8	2	10
Drugs	2	4.3	2	7.4	0	0
Accompanying delusions							χ² = 13.653; p = .006
No	4	8.5	4	14.8	0	0
Persecutory/threat	15	31.9	11	40.7	4	20
Referential/Control-override	6	12.8	5	18.5	1	5
Infidelity^{^b}	8	17	2	7.4	6	30
More than one type	14	29.8	5	18.5	9	45
Accompanying hallucinations							χ² = 3.758; p = .289
No	34	72.3	18	66.7	16	80
Auditory-Command	10	21.3	7	25.9	3	15
Auditory-Elementary	2	4.3	2	7.4	0	0
Visual	1	2.1	0	0	1	5

↵^aFisher’s exact test.
↵^bPost-hoc between-group proportions (impulsive vs. proactive) show significant differences.
p < .05 statistically significant (bold values).