Table 2.

Summary of comparisons between treatment groups

	Aripiprazole (n = 149)	Blonanserin (n = 67)	Olanzapine (n = 95)	Perospirone (n = 36)	Quetiapine (n = 74)	Risperidone (n = 120)
Discontinuation n (%)	83 (55.7)	53 (79.1)	74 (77.9)	27 (75.0)	48 (64.9)	92 (76.7)
Time to discontinuation (day) by Kaplan–Meier analysis	543	364	370	407	402	336
Treatment comparisons by Cox’s proportional hazards regression model
Aripiprazole
Hazard ratio (95% CI)		0.63 (0.44–0.89)	0.62 (0.45–0.85)	0.68 (0.44–1.06)	0.74 (0.51–1.05)	0.58 (0.43–0.78)
P value		0.008**	0.003**	0.086	0.092	<0.001**
Blonanserin
Hazard ratio (95% CI)			0.98 (0.69–1.38)	1.1 (0.70–1.76)	1.16 (0.78–1.71)	0.91 (0.65–1.28)
P value			0.9	0.69	0.48	0.59
Olanzapine
Hazard ratio (95% CI)				1.12 (0.71–1.74)	1.16 (0.80–1.67)	0.93 (0.69–1.27)
P value				0.63	0.43	0.65
Perospirone
Hazard ratio (95% CI)					1.06 (0.66–1.71)	0.84 (0.55–1.29)
P value					0.8	0.43
Quetiapine
Hazard ratio (95% CI)						0.80 (0.56–1.13)
P value						0.2

^**Note: P value is statistically significant.

Abbreviation: CI, confidence interval.