Table 2.

Risk factors of disease-free survival.

Variable	Univariate analysis	p-value
	HR (95% CI)
Medication interruption (without vs. with)	1.235 (0.292~5.221)	0.774
Sex (male vs. female)	1.001 (0.199~5.026)	0.999
Age (≥65 vs. <65 years)	3.261 (0.651~16.346)	0.151
Smoking history (ever smokers vs. never smokers)	1.242 (0.150~10.252)	0.841
Stage	1.256 (0.153~10.284)	0.832
Mutation type Exon 19 vs. L858R	2.41 (0.437~13.286)	0.313
Mutation type Exon 19 vs. others	3.074 (0.430~21.988)	0.263