Table 2.

Competing-Risk Regression Model and Concordance Index for Recurrence and Lung Cancer-Specific Death

p-Stage	Recurrence				Lung cancer-specific death
	Total Size		Invasive Size		Total Size		Invasive Size
	SHR (95% CI)	P	SHR (95% CI)	P	SHR (95% CI)	P	SHR (95% CI)	P
IA1	ref.		ref.		ref.		ref.
IA2	1.14 (0.73–1.80)	0.6	1.53 (1.05–2.22)	0.026	0.85 (0.47–1.54)	0.6	1.18 (0.71–1.98)	0.5
IA3	1.39 (0.85–2.27)	0.19	2.02 (1.31–3.12)	0.002	0.98 (0.50–1.89)	0.9	1.69 (0.93–3.08)	0.088
IB	2.44 (1.55–3.83)	<0.001	2.97 (2.04–4.32)	<0.001	2.14 (1.19–3.82)	0.011	2.87 (1.74–4.74)	<0.001
IIA	3.15 (1.82–5.46)	<0.001	5.43 (3.26–9.06)	<0.001	3.25 (1.64–6.43)	0.001	5.84 (3.06–11.13)	<0.001
C-index (95% CI)	0.593 (0.579–0.642)		0.614 (0.598–0.662)		0.621 (0.603–0.687)		0.634 (0.608–0.695)

CI, confidence interval; C-index, concordance index; p-Stage, pathologic stage; SHR, subhazard ratio.