TABLE 5.

Meta-regression analysis.

Heterogeneity Factor	Coefficient	Std. Err	Z Value	p Value	95% CI
study type	−6.28513	2.811002	−2.24	0.025	−11.79459, −0.7756678
reperfusion duration	0.1080382	0.0830519	1.3	0.193	−0.0547405, 0.270817
route of administration	−0.8261537	0.5889316	−1.4	0.161	−1.980438, 0.328131
animal species	−1.428073	1.7573	−0.81	0.416	−4.872319, 2.016172
staining method	−0.3233558	1.15108	−0.28	0.779	−2.579432, 1.93272
PE type	9.462195	5.151416	1.84	0.066	−0.6343956, 19.55879