Without PSM | With PSM | |||||
---|---|---|---|---|---|---|
Groups | NLNs ≤ 5 | NLNs > 5 | p value | NLNs ≤ 5 | NLNs > 5 | p value |
Total | 3850 | 3443 | 2350 | 2350 | ||
Sex (%) | 0.437* | 0.423* | ||||
Male | 1588 (41.2%) | 1452 (42.2%) | 968 (41.2%) | 940 (40.0%) | ||
Female | 2262 (58.8%) | 1991 (57.8%) | 1382 (58.8%) | 1410 (60.0%) | ||
Age (%) | < 0.001* | 0.906* | ||||
≤ 65 | 1468 (38.1%) | 1517 (44.1%) | 990 (42.1%) | 985 (41.9%) | ||
> 65 | 2382 (61.9%) | 1926 (55.9%) | 1360 (57.9%) | 1365 (58.1%) | ||
TNM stage (%) | 0.004* | 1* | ||||
IA1 | 703 (18.3%) | 541 (15.7%) | 349 (14.9%) | 350 (14.9) | ||
IA2 | 3147 (81.7%) | 2902 (84.3%) | 2001 (85.1%) | 2000 (85.1%) | ||
Grade (%) | < 0.001* | 0.707* | ||||
I | 841 (21.8%) | 774 (22.5%) | 525 (22.3%) | 530 (22.6%) | ||
II | 1622 (42.1%) | 1569 (45.6%) | 1045 (44.5%) | 999 (42.5%) | ||
III | 992 (25.8%) | 847 (24.6%) | 578 (24.6%) | 609 (25.9%) | ||
IV | 55 (1.4%) | 37 (1.1%) | 32 (1.4%) | 32 (1.4%) | ||
Unknown | 340 (8.8%) | 216 (6.3%) | 170 (7.2%) | 180 (7.7%) | ||
Tumor location (%) | < 0.001** | 1** | ||||
Upper lobe | 2258 (58.6%) | 2289 (66.5%) | 1388 (59.1%) | 1395 (59.4%) | ||
Middle lobe` | 311 (8.1%) | 148 (4.3%) | 148 (6.3%) | 146 (6.2%) | ||
Lower lobe | 1216 (31.6%) | 965 (28.0%) | 783 (33.3%) | 777 (33.1%) | ||
Main bronchus | 5 (0.1%) | 4 (0.1%) | 1 (0.0%) | 1 (0.0%) | ||
Overlapping | 16 (0.4%) | 12 (0.3%) | 10 (0.4%) | 10 (0.4%) | ||
Lung NOS | 44 (1.1%) | 25 (0.7%) | 20 (0.9%) | 21 (0.9%) | ||
Tumor size (mean (SD) (mm)) | 14.72 (4.03) | 15.05 (3.86) | < 0.001*** | 15.12 (3.88) | 15.08 (3.81) | 0.690*** |
Race (%) | 0.059** | 0.972** | ||||
American Indian | 15 (0.4%) | 14 (0.4%) | 10 (0.4%) | 12 (0.5%) | ||
Asian | 194 (5.0%) | 203 (5.9%) | 141 (6.0%) | 148 (6.3%) | ||
Black | 324 (8.4%) | 239 (6.9%) | 197 (8.4%) | 196 (8.3%) | ||
White | 3308 (85.9%) | 2983 (86.6%) | 3 (0.1%) | 4 (0.2%) | ||
Unknown | 9 (0.2%) | 4 (0.1%) | 1999 (85.1%) | 1990 (84.7%) | ||
Surgical methods (%) | < 0.001** | 1** | ||||
Wedge resection | 1417 (36.8%) | 230 (6.7%) | 230 (9.8%) | 230 (9.8%) | ||
Segmental resection | 284 (7.4%) | 80 (2.3%) | 79 (3.4%) | 79 (3.4%) | ||
Lobectomy | 2126 (55.2%) | 3102 (90.1%) | 2030 (86.4%) | 2030 (86.4%) | ||
Pneumonectomy | 17 (0.4%) | 28 (0.8%) | 11 (0.5%) | 11 (0.5%) | ||
Unknown | 6 (0.2%) | 3 (0.1%) | 0 (0.0%) | 0 (0.0%) | ||
Histological types (%) | 0.157** | 0.866** | ||||
Adeno | 2503 (65.0%) | 2297 (66.7%) | 1592 (67.7%) | 1565 (66.6%) | ||
SCC | 861 (22.4%) | 745 (21.6%) | 494 (21.0%) | 510 (21.7%) | ||
LCC | 117 (3.0%) | 74 (2.1%) | 56 (2.4%) | 60 (2.6%) | ||
PSC | 3 (0.1%) | 2 (0.1%) | 1 (0.0%) | 0 (0.0%) | ||
Other | 222 (5.8%) | 210 (6.1%) | 134 (5.7%) | 136 (5.8%) | ||
Unknown | 144 (3.7%) | 115 (3.3%) | 73 (3.1%) | 79 (3.4%) |