Predictors of psychiatric hospitalization during 6 months of maintenance treatment with olanzapine long-acting injection: post hoc analysis of a randomized, double-blind study

Table 2 Psychiatric hospitalization parameters by treatment group

Hospitalization parameter	Olazapine-LAI	Sub-therapeutic olanzapine-LAI	Oral olanzapine	pvalue^a
Hospitalization parameter	Olazapine-LAI	Sub-therapeutic olanzapine-LAI	Oral olanzapine	Olanzapine-LAI versus sub-therapeutic olanzapine-LAI	Olanzapine-LAI versus oral olanzapine	Oral olanzapine versus sub-therapeutic olanzapine-LAI
Hospitalization rate, %	5.2	11.1	4.0	0.0088	0.4369	0.0035
Number of hospitalizations, mean (SD)	0.1 (0.4)	0.2 (0.6)	0.1 (0.5)	0.0092	0.4385	0.0038
Number of days hospitalized, mean (SD) ^b	1.5 (12.26)	2.9 (15.03)	2.3 (17.2)	0.0084	0.4639	0.0041

CGI-S Clinical Global Impression-Severity, DAI Drug Attitude Inventory, PANSS Positive and Negative Symptom Score, LAI long-acting injection, SD standard deviation.
^a p values calculated using Chi-square and t-tests.
^bCalculation of the mean number of days includes both patients hospitalized and not hospitalized (calculation is number of days in the hospital including all patients divided by total number of patients in the group).