Overall Survival Analyses following Adjuvant Chemotherapy or Nonadjuvant Chemotherapy in Patients with Stage IB Non-Small-Cell Lung Cancer

Table 4

Subgroup analyses stratified by tumor size for overall survival.

	≤20 mm			21 mm–30 mm			31 mm–40 mm
	HR	95%CI		HR	95%CI		HR	95%CI
Age
<60	1			1			1
61–75	1.343	1.153–1.563	<0.001	1.675	1.407–1.993	<0.001	1.479	1.333–1.640	<0.001
≥75	1.927	1.641–2.264	<0.001	2.525	2.112–3.018	<0.001	2.335	2.097–2.600	<0.001
Gender
Male	1			1			1
Female	0.669	0.606–0.739	<0.001	0.725	0.657–0.801	<0.001	0.722	0.678–0.770	<0.001
History of chemotherapy
Nonadjuvant chemotherapy	1			1			1
Adjuvant chemotherapy	1.068	0.919–1.241	0.394	0.845	0.724–0.986	0.032	0.912	0.833–1.000	0.049