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. 2021 Jul 17;2021:8052752. doi: 10.1155/2021/8052752

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%)