Table II.

OS and LRFS rates of patients with different clinicopathological features according to the use of PORT after propensity score-matching.

	5-year OS rate			5-year LRFS rate
Clinicopathological feature	Non-PORT, %	PORT, %	P-value	Non-PORT, %	PORT, %	P-value
Sex
Female	33.5	59.5	0.203	27.2	58.7	0.037
Male	34.9	45.9	0.137	27.2	45.9	0.008
Age, years
<65	34.5	48.5	0.198	25.0	47.8	0.008
≥65	33.3	59.3	0.131	34.3	59.3	0.064
Smoking index, pack-year
<400	40.3	57.1	0.166	33.3	56.4	0.028
≥400	23.8	41.2	0.121	15.4	41.2	0.005
Type of surgery
Lobectomy	36.9	50.7	0.149	29.3	50.2	0.006
Pneumonectomy	0.0	50.0	0.017	0.0	50.0	0.051
Histology
SCC	26.7	66.7	0.006	16.7	66.7	<0.001
Non-SCC	36.9	45.6	0.560	31.9	44.8	0.170
Pathological T stage
T1-2	35.5	51.5	0.173	29.2	50.8	0.012
T3	31.3	45.5	0.179	21.9	45.5	0.050
No. of N2 stations
Single	70.0	55.9	0.613	58.3	55.9	0.823
Multiple	27.5	49.3	0.035	22.0	48.7	0.002
No. of N2 positive nodes
1-3	54.2	61.0	0.778	44.7	61.0	0.213
≥4	23.0	44.6	0.019	17.2	43.8	0.001
POCT
No	0.0	66.7	0.083	0.0	66.7	0.083
Yes	35.1	50.2	0.077	27.7	49.7	0.002

Kaplan-Meier analysis followed by log-rank test for various subgroups. P-values were calculated by comparing the PORT and non-PORT groups. OS, overall survival; LRFS, local recurrence free survival; SCC, squamous cell carcinoma; PORT, postoperative radiotherapy; POCT, postoperative chemotherapy.