Table 3.

Sensitivity analysis of possible heterogeneity studies.

Reason of exclusion	Excluded studies	Number of studies	I square (%)	SMD	(95% confidence interval)	p value
Lowest mortality	Kitazawa et al. [20]	10	83.5	0.197	(−0.020 to 0.414)	0.076
Highest mortality	Gao et al. [22]	10	82.6	0.114	(−0.098 to 0.326)	0.293
Lowest and highest mortality	Kitazawa et al. [20]	9	83.4	0.139	(−0.084 to 0.361)	0.221
	Gao et al. [22]
Small studies (N < 100)	Becchi et al. [18]	9	83.5	0.241	(0.023 to 0.030)	0.030
	Zampieri et al. [24]