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. 2021 Jan;10(1):279–291. doi: 10.21037/tlcr-20-709

Table 1. Demographic information for patients with stage IV NSCLC before PSM.

All patients (n=30,342) Surgery to primary site (n=2,436), n (%) Non-surgery to primary site (n=27,906), n (%) P
Age <0.001
   Mean 66.67 63.97 66.90
   SD 11.48 10.88 11.15
Gender <0.001
   Male 16,976 1,261 (51.77) 15,715 (56.31)
   Female 13,366 1,175 (48.23) 12,191 (43.69)
Race <0.001
   White 23,814 1,995 (81.90) 21,819 (78.19)
   Black 4,077 268 (11.00) 3,809 (13.65)
   Other 2,451 173 (7.10) 2,278 (8.16)
T stage <0.001
   T1 6,309 1,006 (41.30) 5,303 (19.00)
   T2 7,908 610 (25.04) 7,298 (26.15)
   T3 6,189 380 (15.60) 5,809 (20.82)
   T4 9,936 440 (18.06) 9,496 (34.03)
N stage <0.001
   N0 7,622 1,168 (47.95) 6,454 (23.13)
   N1 2,788 383 (15.72) 2,405 (8.62)
   N2 14,616 765 (31.40) 13,851 (49.63)
   N3 5,316 120 (4.93) 5,196 (18.62)
M stage <0.001
   M1a 6,662 774 (31.77) 5,888 (21.10)
   M1b 23,680 1,662 (68.23) 22,018 (78.90)
Tumor position <0.001
   Right bronchus 897 44 (1.81) 853 (3.06)
   Right upper lobe 4,951 452 (18.56) 4,499 (16.12)
   Right middle lobe 10,134 749 (30.75) 9,385 (33.63)
   Right lower lobe 1,375 133 (5.46) 1,242 (4.45)
   Left bronchus 623 24 (0.99) 599 (2.15)
   Left upper lobe 8,113 650 (26.68) 7,463 (26.74)
   Left lower lobe 3,831 321 (13.18) 3,510 (12.58)
   Over lapping lesion 418 63 (2.59) 355 (1.27)
Histology <0.001
   Large cell 1,333 115 (4.72) 1,218 (4.36)
   Adenocarcinoma 18,573 1,649 (67.69) 16,924 (60.65)
   Squamous cell 9,130 560 (22.99) 8,570 (30.71)
   Adeno-squamous 517 80 (3.28) 437 (1.57)
   Neuroendocrine 789 32 (1.31) 757 (2.71)
Grade <0.001
   I 1,789 195 (8.00) 1,594 (5.71)
   II 9,184 904 (37.11) 8,280 (29.67)
   III 18,164 1,240 (50.90) 16,924 (60.65)
   IV 1,205 97 (3.98) 1,108 (3.97)
Radiation <0.001
   Yes 15,450 1,087 (44.62) 14,363 (51.47)
   None/unknown 14,892 1,349 (55.38) 13,543 (48.53)
Chemotherapy 0.910
   Yes 16,832 1,354 (55.58) 15,478 (55.46)
   None/unknown 13,510 1,082 (44.42) 12,428 (44.54)
Surgery to other sites <0.001
   Yes 1,574 374 (15.35) 1,200 (4.30)
   None/unknown 28,768 2,062 (84.65) 26,706 (95.70)

NSCLC, non-small cell lung cancer; PSM, propensity score matching; SD, standard deviation.