Table 1 Baseline characteristics of enrolled patients before and after PSM
Characteristic | Before matching | After matching | ||||
|---|---|---|---|---|---|---|
< 65 (n, %) | ≥ 65 (n, %) | P value | < 65 (n, %) | ≥ 65 (n, %) | P value | |
Marital status | < 0.001 | 0.614 | ||||
Married | 1674 (37.2) | 313 (25.9) | 303 (25.0) | 313 (25.9) | ||
Unmarried and others | 2821 (62.8) | 897 (74.1) | 907 (75.0) | 897 (74.1) | ||
Race | < 0.001 | 0.154 | ||||
White | 3248 (72.3) | 813 (67.2) | 815 (67.4) | 813 (67.2) | ||
Black | 774 (17.2) | 201 (16.6) | 227 (18.8) | 201 (16.6) | ||
Others | 473 (10.5) | 196 (16.2) | 168 (13.8) | 196 (16.2) | ||
Histology | 0.529 | 0.600 | ||||
SCC | 3873 (86.2) | 1034 (85.5) | 1043 (86.2) | 1034 (85.5) | ||
Non-SCC | 622 (13.8) | 176 (14.5) | 167 (13.8) | 176 (14.5) | ||
Differentiation | 0.116 | 0.315 | ||||
Well or fairly | 1607 (35.8) | 400 (33.1) | 435 (36.0) | 400 (33.1) | ||
Poorly or undifferentiated | 1540 (34.2) | 414 (34.2) | 391 (32.3) | 414 (34.2) | ||
Unknown | 1348 (30.0) | 396 (32.7) | 384 (31.7) | 396 (32.7) | ||
Tumor size (mm) | < 0.001 | 0.186 | ||||
< 60 | 1272 (28.3) | 393 (32.5) | 385 (31.8) | 393 (32.5) | ||
≥ 60 | 1836 (40.8) | 356 (29.4) | 396 (32.7) | 356 (29.4) | ||
Unknown | 1387 (30.9) | 461 (38.1) | 429 (35.5) | 461 (38.1) | ||
2014 FIGO stage | < 0.001 | 0.585 | ||||
IIB | 1424 (31.7) | 385 (31.8) | 380 (31.4) | 385 (31.8) | ||
IIIA | 137 (3.0) | 89 (7.4) | 74 (6.1) | 89 (7.4) | ||
IIIB | 2625 (58.4) | 620 (51.2) | 644 (53.2) | 620 (51.2) | ||
IVA | 309 (6.9) | 116 (9.6) | 112 (9.3) | 116 (9.6) | ||
Radiotherapy (RT) | < 0.001 | 0.870 | ||||
EBRT alone | 2032 (45.2) | 676 (55.9) | 672 (55.5) | 676 (55.9) | ||
EBRT + BRT | 2463 (54.8) | 534 (44.1) | 538 (44.5) | 534 (44.1) | ||
Chemotherapy (CT) | < 0.001 | 0.963 | ||||
No/Unknown | 408 (9.1) | 316 (26.1) | 315 (26.0) | 316 (26.1) | ||
Yes | 4087 (90.9) | 894 (73.9) | 895 (74.0) | 894 (73.9) | ||