Table 2.

All the forest plot data summary.

Subgroup	Article number	Total (95% CI)	I 2	Z	P	Model
Chinese	6	214.15 [57.65, 370.65]	99%	2.68	P = 0.007	Random
Caucasian	4	98.40 [−1585.08, 1781.88]	95%	0.11	P = 0.91	Random
Plasma	2	220.47 [31.27, 409.67]	0	2.28	P = 0.02	Fixed
Serum	9	358,64 [198.04, 519.24]	99%	4.38	P < 0.0001	Random
Total	11	329.46 [182.51, 476.42]	99%	4.39	P < 0.0001	Random