Table 3.

Factors associated with clozapine antipsychotic polypharmacy in multivariate regression analysis.

Factors	Odds ratio	95% CI*	P
Sex-male, n (%)	1.190	1.030–1.373	.018
Age (year), mean (SD)	0.992	0.9851–0.9996	.040
Age of onset (year), mean (SD)	0.988	0.9803–0.9962	.004
No. of previous hospitalizations, mean (SD)	1.021	1.0087–1.0343	.001
Length of hospital stay (days), mean (SD)	0.9997	0.9995–0.9999	.001
Clozapine daily dose (mg), mean (SD)	0.9989	0.9983–0.9995	<.001

Bolded values are statistically significant.

^*CI = confidence interval.