Table 5.

Clinical characteristics and smoking level in patients

	Smoking index category
		400=<, <800 (N=71)	800=<, <1200 (N=80)	>=1200 (n=49)	P-value
T Stage [n(%)]					<0.0001 a
T1		9 (12.7%)	2 (2.5%)	1 (2.0%)
T2		30 (42.3%)	21(26.3%)	8 (16.3%)
T3		18 (25.4%)	35 (43.8%)	15(30.6%)
T4		14 (19.7%)	22 (27.5%)	25 (51.0%)
Total		71	80	49
N Stage [n(%)]					<0.0001 a
N0		39 (54.9%)	17 (21.3%)	11 (22.4%)
N1		18 (25.4%)	32 (40.0%)	10 (20.4%)
N2		14 (19.7%)	30 (37.5%)	28 (57.1%)
N3		0	1 (1.3%)	0
Total		71	80	49
Clinical Stage [n(%)]				NA	<0.0001 a
Ⅰ		9 (12.7%)	2 (2.5%)	1 (2.0%)
Ⅱ		26 (36.6%)	6 (7.5%)	3 (6.1%)
Ⅲ		17 (23.9%)	35 (43.8%)	13 (26.5%)
Ⅳ		19 (26.8%)	37 (46.3%)	32 (65.3%)
Total		71	80	49