Table 9.

Sensitivity analysis on the results of serum and plasma levels in adults.

First author, year	Sample	Reason for removing	MD (95% CI)	Z	P value	I2	Ph
Hargens, 2013	Serum	Outlier data	2.89 (2.54, 3.24)	16.04	<0.00001	99%	<0.00001
Harsch, 2007	Plasma	Outlier data	2.78 (1.91, 3.66)	6.24	<0.00001	99%	<0.00001