Table 4.

Details of the Illness and Treatment of Stranger-Homicide Offenders With Psychosis

	Stranger-Homicides, n (%)	Family-Homicides, N (%)	Odds Ratio or t Statistic	95% Confidence Interval of the Odds Ratio, P Value
Total	42	42
Schizophrenia spectrum	39 (93)	37 (88)	1.76	0.39–7.87
Alcohol misuse	8 (19)	8 (19)	1.0	0.34–2.97
Cannabis misuse	14 (33)	15 (36)	0.90	0.37–2.21
Stimulant misuse	6 (14)	1 (2)	6.83	0.78–59.5
Prior head injury	11 (26)	7 (17)	1.77	0.61–5.14
Thought disorder	27 (64)	31 (74)	0.64	0.25–1.62
Delusions of a threat	18 (43)	14 (33)	1.50	0.62–3.64
Command auditory hallucinations	5 (12)	6 (14)	0.81	0.23–2.89
Prominent negative symptoms	13 (31)	22 (52)	0.41	0.17–0.99a
Impaired recollection of the homicide	10 (24)	18 (43)	0.42	0.16–1.06
Duration of illness in years (SD)	4.5 (3.8)	4.0 (4.75)	T = −0.53	P = 0.59
No prior antipsychotic treatment	27 (64)	22 (52)	1.63	0.68–3.20
Ever admitted to a psychiatric hospital	16 (38)	19 (45)	0.76	0.31–1.78
Antipsychotic treatment at the time of homicide	5 (12)	8 (19)	0.57	0.17–1.93
In contact with mental health services in the month before the homicide	11 (26)	13 (31)	0.79	0.31–2.0

^aSignificant at <0.05.