Table 1.

Differences of the clinicopathological features in RCS subgroups

Features	Patient No	RCS
		RCS 1	RCS 2	RCS 3	P
Age (years)					< 0.001*
< 60	90	52	33	5
≥ 60	64	18	32	14
Gender					0.004*
Male	77	25	39	13
Female	77	45	26	6
Type of resection					0.788
Lobectomy	114	50	50	14
Segmentectomy	40	20	15	5
Micropapillary or solid component					0.830
Without or unknown	120	56	50	14
With	34	14	15	5
Tobacco use history					0.001*
Never	119	63	45	11
Current + former	35	7	20	8
Alcohol use history					0.972
Never	100	45	43	12
Current + former	54	25	22	7
Hypertension					0.060
Without	119	60	45	14
With	35	10	20	5
Combined T stages					0.004*
T1	123	63	49	11
T2	31	7	16	8
TNM stages					0.006*
IA	124	63	50	11
IB	30	7	15	8

^*With significant statistical difference

No Number, RCS Red cell distribution width and carcinoembryonic antigen score, TNM Tumor-Node-Metastasis