Table 1. Clinicopathological characters in training and validation cohorts.

Characteristic	All (n = 131)		Training cohorts (n = 87)	Validation cohorts (n = 44)	P
Age, yrs	60† (range: 32–80)		61† (range: 32–80)	58† (range: 32–75)	0.590
Sex (%)					0.546
Male	116	88.5%	76	40
Female	15	11.5%	11	4
Smoking habit					0.278
No	28	21.4%	21	7
Yes	103	78.6%	66	37
Tumor Size (cm)	4 † (range: 0.6–11)		4† (range: 1–8)	4.5† (range: 0.6–11)	0.672
Tumor location					0.689
Left Upper Lobe	37	28.2%	27	10
Left Lower Lobe	27	20.6%	15	12
Right Upper Lobe	27	20.6%	16	11
Right Middle Lobe	11	8.4%	7	4
Right Lower Lobe	29	22.1%	22	7
Tumor differentiation					0.379
Well differentiated	7	5.3%	6	1
Moderately differentiated	36	27.5%	24	12
Poorly differentiated	88	67.2%	57	31
Pathological Stage (%)					0.878
IA	19	14.5%	12	7
IB	36	27.5%	26	10
IIA	17	13.0%	11	6
IIB	17	13.0%	10	7
IIIA	40	30.5%	26	14
IIIB	2	1.5%	2	0
Follow-up (months)					0.517
Median	49.03		48.70	51.75
Range	0.63–90.83		0.63-90.83	1.37-83.90
Mean	47.23		46.26	49.15
OLR1 immunostaining score					0.135
0	18	13.7%	14	4
1	28	21.4%	14	14
2	39	29.8%	29	10
3	46	35.1%	30	16
BMI ( kg/m2)					0.209
Median	22.06		22.32	21.77
Range	13.70-31.25		13.70-31.25	16.44-26.95
Mean	22.26		22.48	21.82

^†Median values are listed