Table 2. Cox proportional hazards multivariable analysis results for the HI standard.

	Station 10, 11					Station 12, 13, 14					HI standard
	P value	HR	95% CI			P value	HR	95% CI			P value	HR	95% CI
			Lower	Upper				Lower	Upper				Lower	Upper
Age (years)
<65	Ref.
≥65	<0.001	1.769	1.527	2.05		<0.001	1.771	1.528	2.052		<0.001	1.766	1.524	2.046
Sex
Male	Ref.
Female	<0.001	0.517	0.428	0.625		<0.001	0.521	0.431	0.629		<0.001	0.521	0.431	0.629
Histologic
SCC	Ref.
AC	0.267	0.908	0.766	1.077		0.227	0.9	0.759	1.067		0.219	0.899	0.758	1.066
SAC	<0.001	2.086	1.501	2.900		<0.001	1.991	1.432	2.768		<0.001	1.961	1.411	2.727
Other	0.948	1.015	0.649	1.588		0.978	1.006	0.643	1.575		0.957	1.012	0.647	1.584
T stage
T1	Ref.
T2	<0.001	1.378	1.169	1.625		<0.001	1.375	1.167	1.621		<0.001	1.383	1.173	1.631
T3	<0.001	1.889	1.508	2.367		<0.001	1.873	1.494	2.347		<0.001	1.882	1.501	2.358
Standards
No	Ref.
Yes	0.006	0.758	0.622	0.925		0.017	0.836	0.722	0.968		<0.001	0.75	0.644	0.875

HI standard, hilar and intrapulmonary standard; SCC, squamous cell carcinoma; AC, adenocarcinoma; ASC, adenosquamous carcinoma.