Table 3. Clinical characteristics and baseline demographics of schizophrenia patients treated with risperidone.

Features	Total (n = 130)	Male (n = 45)	Female (n = 85)	p value
Age (years)	36.3±11.2	35.9±12.8	36.4±10.4	0.798
Age of onset (years)	30.3±10.3	28.4±10.6	31.3±10.1	0.132
Plasma risperidone levels (ng/ml)	7.6±6.3	7.0±6.4	7.9±6.3	0.469
Plasma 9-hydrorisperidone levels (ng/ml)	23.4±16.2	23.9±21.1	23.1±13.2	0.789
Baseline Prolactin (mIU/L)	775.2±733.8	508.0±340.2	907.2±835.5	0.004*
Baseline BPRS score	42.4±12.4	42.2±12.6	42.5±12.3	0.879

Data are shown as mean±SD. BPRS: Brief Psychiatric Rating Scale. *Significant difference (p<0.05) between males and females.