Table 2.
Baseline characteristics of the propensity-score matched population.
| Nonadjuvant chemotherapy (n = 2187) | Adjuvant chemotherapy (n = 2187) | P value | Standardized difference | |
|---|---|---|---|---|
| Gender | 0.952 | 0 | ||
| Male | 1005 (46.0%) | 1003 (45.9%) | ||
| Female | 1182 (54.0%) | 1184 (54.1%) | ||
|
| ||||
| Age | 0.887 | <0.001 | ||
| <60 | 576 (26.3%) | 564 (25.8%) | ||
| 61–75 | 1308 (59.8%) | 1322 (60.4%) | ||
| ≥75 | 303 (13.9%) | 301 (13.8%) | ||
|
| ||||
| Race | 0.678 | 0.030 | ||
| White | 1855 (84.8%) | 1836 (84.0%) | ||
| Black | 181 (8.3%) | 187 (8.6%) | ||
| Others | 151 (6.9%) | 164 (7.4%) | ||
|
| ||||
| Marital status | 0.682 | −0.022 | ||
| Divorced | 249 (11.4%) | 266 (12.2%) | ||
| Married | 1333 (59.9%) | 1328 (60.7%) | ||
| Others | 605 (27.7%) | 593 (27.1%) | ||
|
| ||||
| Laterality | 0.950 | 0.003 | ||
| Left | 842 (38.5%) | 840 (38.4%) | ||
| Right | 1345 (61.5%) | 1347 (61.6%) | ||
|
| ||||
| Grade | 0.598 | 0.023 | ||
| Well/moderate | 1163 (53.2%) | 1132 (51.8%) | ||
| Poor/undifferentiated | 903 (41.3%) | 935 (42.7%) | ||
| Unknown | 121 (5.5%) | 120 (5.5%) | ||
|
| ||||
| Pathological subtype | 0.845 | 0.017 | ||
| Adenocarcinoma | 1045 (47.8%) | 1027 (47.0%) | ||
| Squamous cell carcinoma | 407 (18.6%) | 411 (18.8%) | ||
| Others | 735 (33.6%) | 749 (34.2%) | ||
|
| ||||
| Visceral pleural invasion | 0.829 | <0.001 | ||
| No | 869 (39.7%) | 862 (39.4%) | ||
| Yes | 1318 (60.3%) | 1325 (60.6%) | ||
|
| ||||
| Tumor size (mm) | 0.994 | <0.001 | ||
| ≤20 | 469 (21.4%) | 470 (21.5%) | ||
| 21–30 | 475 (21.7%) | 472 (21.6%) | ||
| 31–40 | 1243 (56.9%) | 1245 (56.9%) | ||
|
| ||||
| Surgical procedure | 0.686 | 0.013 | ||
| Lobectomy | 1823 (83.3%) | 1814 (82.9%) | ||
| Segmentectomy | 364 (16.7%) | 373 (17.1%) | ||
|
| ||||
| No. of resected lymph nodes | 0.288 | −0.023 | ||
| 0 | 182 (8.3%) | 214 (9.8%) | ||
| 1–3 | 388 (17.7%) | 370 (16.9%) | ||
| ≥4 | 1518 (69.4%) | 1495 (68.4%) | ||
| Unknown | 99 (4.6%) | 108 (4.9%) | ||