Table 2.

Univariate and multivariate analysis of overall survival after matching.

Characteristics	Univariate			Multivariate
	HR	95%CI	p-value	HR	95%CI	p-value
Age (years)	1.039	1.028–1.051	< 0.001*	1.039	1.028–1.051	< 0.001*
Sex			< 0.001*			0.001*
Male	Reference			Reference
Female	0.671	0.554–0.813	< 0.001*	0.711	0.584–0.867	0.001*
Laterality			0.553
Left	Reference
Right	0.944	0.780–1.142	0.553
Race			0.438
White	Reference
Black	1.128	0.811–1.570	0.473
Other	0.685	0.409–1.149	0.151
Unknown	0.002	0–791532416	0.947
Marital status			0.028*			0.047*
Married	Reference			Reference
Unmarried	1.254	1.033–1.522	0.022	1.264	1.036–1.543	0.021*
Unknown	0.725	0.385–1.366	0.320	0.830	0.439–1.568	0.565
Year at diagnosisa			0.179
Statea			0.173
Surgical lobe			0.697
Upper	Reference
Middle	1.116	0.527–2.363	0.775
Lower	0.894	0.729–1.096	0.280
Unknown	1.239	0.307–4.994	0.763
Surgery			0.005*			0.009*
Wedge	Reference			Reference
Segmentectomy	0.759	0.626–0.920	0.005*	0.774	0.638–0.939	0.009*
Grade			< 0.001*			< 0.001*
I	Reference			Reference
II	2.041	1.533–2.716	< 0.001*	1.874	1.405–2.500	< 0.001*
III	2.414	1.761–3.308	< 0.001*	2.448	1.776–3.375	< 0.001*
IV	2.188	0.686–6.981	0.186	2.234	0.696–7.166	0.177
Unknown	1.422	0.839–2.412	0.191	1.611	0.946–2.743	0.079
Stage			< 0.001*			0.004*
IA1	Reference
IA2	1.738	1.247–2.423	0.001*	1.454	1.040–2.033	0.029*
IA3	2.316	1.639–3.272	< 0.001*	1.757	1.237–2.496	0.002*

HR, hazard ratio; CI, confidence interval.

^aDetailed data of year at diagnosis and state are listed in Table S2.

^*Indicates p < 0.05.