Table 2. Demographic information for patients with stage IV NSCLC after PSM.
| Surgery to primary site (n=2,436), n (%) | Non-surgery to primary site (n=2,436), n (%) | P | |
|---|---|---|---|
| Age | 0.877 | ||
| Mean | 63.97 | 63.56 | |
| SD | 10.88 | 11.02 | |
| Gender | 0.566 | ||
| Male | 1,261 (51.77) | 1,247 (51.19) | |
| Female | 1,175 (48.23) | 1,189 (48.81) | |
| Race | 0.994 | ||
| White | 1,995 (81.90) | 1,994 (81.80) | |
| Black | 268 (11.00) | 273 (11.20) | |
| Other | 173 (7.10) | 169 (7.00) | |
| T stage | 0.673 | ||
| T1 | 1,006 (41.30) | 946 (38.80) | |
| T2 | 610 (25.04) | 624 (25.60) | |
| T3 | 380 (15.60) | 415 (17.00) | |
| T4 | 440 (18.06) | 451 (18.60) | |
| N stage | 0.142 | ||
| N0 | 1,168 (47.95) | 1,158 (47.60) | |
| N1 | 383 (15.72) | 345 (14.20) | |
| N2 | 765 (31.40) | 785 (32.20) | |
| N3 | 120 (4.93) | 148 (6.00) | |
| M stage | 0.758 | ||
| M1a | 774 (31.77) | 771 (31.6) | |
| M1b | 1,662 (68.23) | 1,665 (68.4) | |
| Tumor position | 0.929 | ||
| Right bronchus | 44 (1.81) | 43 (1.77) | |
| Right upper lobe | 452 (18.56) | 460 (18.88) | |
| Right middle lobe | 749 (30.75) | 744 (30.54) | |
| Right lower lobe | 133 (5.46) | 129 (5.30) | |
| Left bronchus | 24 (0.99) | 26 (1.10) | |
| Left upper lobe | 650 (26.68) | 642 (26.35) | |
| Left lower lobe | 321 (13.18) | 330 (13.55) | |
| Over lapping lesion | 63 (2.59) | 56 (2.20) | |
| Histology | 0.878 | ||
| Large cell | 115 (4.72) | 105 (4.40) | |
| Adenocarcinoma | 1,649 (67.69) | 1,663 (68.20) | |
| Squamous cell | 560 (22.99) | 567 (23.20) | |
| Adeno-squamous | 80 (3.28) | 66 (2.80) | |
| Neuroendocrine | 32 (1.31) | 35 (1.40) | |
| Grade | 0.492 | ||
| I | 195 (8.00) | 173 (7.20) | |
| II | 904 (37.11) | 885 (36.40) | |
| III | 1,240 (50.90) | 1,281 (52.60) | |
| IV | 97 (3.98) | 97 (4.00) | |
| Radiation | 0.686 | ||
| Yes | 1,087 (44.62) | 1,346 (55.20) | |
| None/unknown | 1,349 (55.38) | 1,090 (44.80) | |
| Chemotherapy | 0.437 | ||
| Yes | 1,354 (55.58) | 1,080 (44.40) | |
| None/unknown | 1,082 (44.42) | 1,356 (56.60) | |
| Surgery to other sites | 0.469 | ||
| Yes | 374 (15.35) | 355 (14.60) | |
| None/unknown | 2,062 (84.65) | 2,436 (85.40) |
NSCLC, non-small cell lung cancer; PSM, propensity score matching; SD, Standard deviation.