Table 4.

Results of subgroup meta-analysis for CA15-3 using stage I, II, and III database.

Tumor stage	Analysis method	Heterogeneity		OR				Publication bias
		I2 (%)	p-value	Overall	Lower	Upper	p-value	Begg	Egger
Stage I	Random	98.4	2.7×10−23	2.03	1.66	2.40	9.8×10−27	0.806	0.029
Stage II	Random	97.7	2.7×10−19	3.88	3.40	4.35	5.1×10−41	1.000	0.010
Stage III	Random	98.2	1.0×10−26	5.12	4.63	5.61	6.7×10−48	0.734	0.308