Table 10.

The results of trim-and-fill method.

Sample	Value	Studies trimmed	Fixed effects			Random effects			Q value
			Point estimate	Lower limit	Upper limit	Point estimate	Lower limit	Upper limit
Serum	Observed	–	0.02403	0.01818	0.02988	2.41151	2.07576	2.74726	4,869.43934
	Adjusted	14	0.02287	0.01702	0.02872	0.45786	0.08567	0.83005	7,858.53130
Plasma	Observed	–	0.25196	0.22049	0.28343	2.94160	1.87192	4.01128	1,640.40890
	Adjusted	10	0.20025	0.116914	0.23136	0.28995	−0.73377	1.31366	3,295.78126