Table 3. Meta-analysis results of each outcome indicator.

outcome indicator	Heterogeneity test results		Effect models	Meta-analysis results
	I2 (%)	P		Effect sizes	95%CI	P
Behavioral scores	88	<0.00001	Random	MD = -15.01	[-18.01, -12.01]	<0.00001
CGRP	97	<0.00001	Random	MD = -16.14	[-21.45, -10.83]	<0.00001
SP	96	<0.00001	Random	MD = -11.47	[-15.97, -6.98]	<0.00001
50%PTW	87	<0.0001	Random	MD = 1.96	[1.15, 2.77]	<0.00001
Gsa	0	0.50	Fixed	MD = 24.01	[20.10, 27.92]	<0.00001
Gia	0	0.50	Fixed	MD = 24.01	[20.10, 27.92]	<0.00001
NO	0	0.99	Fixed	MD = -3.02	[-3.79, -2.26]	<0.00001