Table 3. Multiple logistic regression for EGFR mutation in lung adenocarcinoma patients (n = 6483).

	EGFR Mutation	EGFR Wild-type	Odds ratio*	P value
Gender, n (%)
Male	1586 (40.7)	1511 (58.4)	1.00 (reference)
Female	2311 (59.3)	1075 (41.6)	1.19 (1.04–1.36)	< .001
Age, n (%)
≦ 45 years old	213 ( 5.5)	193 ( 7.5)	1.00 (reference)
> 45 years old	3684 (94.5)	2393 (92.5)	1.38 (1.12–1.69)	0.001
Stage, n (%)
I–IIIA	635 (16.3)	378 (14.6)	1.00 (reference)
IIIB–IV	3262 (83.7)	2208 (85.4)	0.95 (0.82–1.09)	0.068
Smoking history, n (%)
Never smoker	2878 (73.9)	1323 (51.2)	1.00 (reference)
Ever smoker	1019 (26.1)	1263 (48.4)	0.42 (0.36–0.48)	< .001

Abbreviations: EGFR, epidermal growth factor receptor.

^*Odds ratios for EGFR mutation.