Table 2.

Sensitivity analysis of different outcome indicators.

Models			Relative risk (95% CI)		Z value		P value
Adverse drug event reporting
	Random effect model	2.59 (1.26-5.30)		2.59		.009
	Fixed effect model	2.06 (1.67-2.53)		6.83		＜.001
Medication adherence
	Random effect model	1.16 (1.04-1.29)		2.65		.008
	Fixed effect model	1.17 (1.04-1.31)		2.71		.007
Medication errors
	Model that retained large-sample studies	1.54 (0.33-7.29)		0.55		.58
	Model that did not retain large-sample studies	0.69 (0.38-1.24)		1.25		.21