Table 5.

Subgroup analyses stratified by tumor size for lung cancer specific survival.

	TS ≤ 20 mm			20 mm < TS ≤ 30 mm			30 mm < TS ≤ 40 mm
	HR	95% CI	P	HR	95% CI	P	HR	95% CI	P
Surgical procedure
Lobectomy	1			1			1
Segmentectomy	1.029	0.682–1.552	0.893	1.144	0.795–1.645	0.469	1.118	1.005–1.280	0.047*
Age
≤ 60	1			1			1
61–75	1.317	1.026–1.691	0.031*	1.283	1.009–1.631	0.042*	1.485	1.251–1.764	<0.001*
>75	1.376	1.010–1.874	0.043*	1.607	1.242–2.81	<0.001*	1.805	1.503–2.167	<0.001*
Grade
Well/Moderate	1			1			1
Poor/Undifferentiated	1.266	1.012–1.583	0.039*	1.324	1.103–1.589	0.003*	1.231	1.092–1.387	0.001*
Unknown	0.902	0.562–1.450	0.671	0.970	0.659–1.428	0.878	0.698	0.523–0.933	0.015*

^*indicates that the difference was statistically significant.

TS, tumor size.