A comparison of olanzapine and risperidone on the risk of psychiatric hospitalization in the naturalistic treatment of patients with schizophrenia

Table 1 Patient characteristics

Characteristic	Olanzapine n = 169	Risperidone n = 115
Age at enrollment, mean (SD)†	43.5 (11.2)	39.3 (12.8)
Age at illness onset, mean (SD)	19.5 (9.0)	19.6 (10.1)
Male, %	62.9%	54.5%
Race, %
White	52.8%	49.1%
Black	41.5%	39.1%
Other	5.7%	11.8%
Diagnosis, %
Schizoaffective	34.0%	32.1%
Schizophrenia, paranoid	37.1%	31.2%
Schizophrenia, undifferentiated	18.2%	19.6%
Other	10.7%	17.1%
Number of prior episodes of schizophrenia, mean (SD)^‡	25.6 (37.1)	28.9 (39.7)
Prior use of antipsychotic, %^§	66.0%	66.1%
Prior use of depot formulation, %^§	23.9%	18.7%
Prior use of mood stabilizer, %^§	33.3%	24.1%
Prior psychiatric hospitalization, %^§	16.0%	14.8%
Days with concomitant antipsychotic, mean (SD)	162 (12.6)	158.3 (15.3)

† Significant group differences at p < 0.05 ‡ At enrollment, response to, "How many previous episodes of schizophrenia have you had? §Binary variable (yes / no); Prior period: 60 days prior to initiation of the index drug

ISSN: 1744-859X