Table 4.

Results of meta-regression analysis.

	Year of publication		Number of study arms		Duration of the study		PANSS Score
	P	R	P	r	P	r	P	r
Withdrawal for AEs	0.542	0.083	0.029	0.292	0.169	0.190	0.091	0.264
All AEs	0.308	−0.149	0.125	0.222	0.290	−0.158	0.052	0.318
Nervous system disorders	0.056	−0.255	0.499	0.091	0.521	−0.088	0.020	0.359
Psychiatric disorders	0.189	−0.177	0.005	−0.369	0.002	0.416	0.017	−0.367
Gastrointestinal disorders	0.961	−0.007	0.158	0.205	0.884	0.021	0.004	0.460

The effect of 4 factors (year of publication; number of study arms; duration; and PANSS score) on reported outcome measures were analyzed. P-values and r coefficients are given.

AEs, Adverse Events; PANSS, Positive and Negative Syndrome Scale.