Table 2.

Summary of publication bias test

	Begg’s test		Egger’s test
	Z	P	t (bias)	P
EGFR Mutations and gender	0.78	0.436	-0.60	0.564
EGFR Mutations and smoking history	0.36	0.721	1.02	0.339
EGFR Mutations and histology type	0.59	0.553	1.25	0.234
EGFR Mutations and stage	0.34	0.734	0.64	0.590