Table 3. Subgroup analysis for association between EGFR expression and overall survival in GC patients.

		Overall survival		95%CI		Heterogeneity
Group factors	Subgroup	HR	P value	Lower	Upper	I 2	P value
Total	Total	1.19	0.015	1.04	1.37	66.4%	0.001
Contain stage IV patients	Yes	1.11	0.302	0.91	1.37	55.9%	0.059
	No	1.22	0.052	1.0	1.5	65.4%	0.001
Chemistry therapy	Yes	1.21	0.291	0.85	1.71	65.4%	0.008
	No	1.18	0.042	1.01	1.38	65.8%	0.001
Patients number≥100	Yes	1.13	0.113	0.97	1.31	68.5%	0.001
	No	1.44	0.044	1.01	2.05	48.3%	0.06
Positive rate≥50%	Yes	1.04	0.744	0.84	1.28	54.7%	0.024
	No	1.29	0.012	1.06	1.59	63.1%	0.001

HR, hazard ratio; CI, confidence interval.