Table 1 Baseline demographics and clinical characteristics of the study participants
Variable | N (%) | p value | |
|---|---|---|---|
Surgery (N = 755) | Radiotherapy (N = 886) | ||
Age, median ± SD, y | 82.6 ± 2.4 | 84.1 ± 3.1 | < 0.001 |
Sex | 0.491 | ||
Male | 298 (39.5%) | 335 (37.8%) | |
Female | 457 (60.5%) | 551 (62.2%) | |
Race | 0.149 | ||
White | 652 (86.4%) | 754 (85.1%) | |
Black | 40 (5.3%) | 67 (7.6%) | |
Other | 63 (8.3%) | 65 (7.3%) | |
Marital status | < 0.001 | ||
Married | 340 (45.0%) | 301 (34.0%) | |
Unmarried | 379 (50.2%) | 549 (62.0%) | |
Unknown | 36 (4.8%) | 36 (4.1%) | |
Year of diagnosis | < 0.001 | ||
2012–2014 | 393 (52.1%) | 364 (41.1%) | |
2015–2017 | 362 (47.9%) | 522 (58.9%) | |
Tumor size, cm | < 0.001 | ||
T ≤ 1 cm | 69 (9.1%) | 35 (3.9%) | |
1 < T ≤ 2 cm | 373 (49.4%) | 379 (42.8%) | |
2 < T ≤ 3 cm | 313 (41.5%) | 472 (52.3%) | |
Histology | < 0.001 | ||
Adenocarcinoma | 520 (68.9%) | 511 (57.7%) | |
Squamous cell carcinoma | 159 (21.0%) | 304 (34.3%) | |
Other | 76 (10.1%) | 71 (8.0%) | |
Grade | < 0.001 | ||
Well differentiated | 201 (26.6%) | 98 (11.0%) | |
Moderately differentiated | 335 (44.4%) | 187 (21.1%) | |
Poorly or undifferentiated | 163 (21.6%) | 169 (19.1%) | |
Unknown | 56 (7.4%) | 432 (48.8%) | |
Tumor location | 0.023 | ||
Right upper lobe | 251 (33.3%) | 300 (33.9%) | |
Right middle lobe | 56 (7.4%) | 32 (3.6%) | |
Right lower lobe | 143 (18.9%) | 164 (18.5%) | |
Left upper lobe | 185 (24.5%) | 235 (26.5%) | |
Left lower lobe | 111 (14.7%) | 139 (15.7%) | |
Other | 9 (1.2%) | 16 (1.8%) | |