Table 4. Results of meta-regression on OS of blood miR-122 expression in hepatocellular carcinoma.

Variables	Details	tau2	I2 (%)	Adj R2 (%)	P value
Year	2013–2016	0.73	87.82	–29.29	0.46
Country	Germany, China, South Korea	0.50	86.34	11.27	0.34
Design	Prospective, Retrospective	0.61	88.00	–21.49	0.51
Sample	Serum, Plasma	0.45	87.43	20.85	0.16
Number	295, 136, 120, 122, 161, 62	0.69	86.03	–21.90	0.47
Stage	None, I–IV	0.52	87.59	8.14	0.39
Method	qRT-PCR, RT-qPCR	0.51	87.01	10.36	0.22
Follow-up	26, 48, 96, 40, 79, 125	0.28	84.28	50.82	0.08
Follow-up	< 48, ≥ 48	0.00	9.67	100.00	0.01