Table 1.
Comparison of the demographic and clinical characteristics of patients before and after PSM
| Variables | Before PSM | After PSM | |||||
|---|---|---|---|---|---|---|---|
| Total (n = 2,214) | ET group (n = 1,417) | SR group (n = 797) | P-value | ET group (n = 698) | SR group (n = 698) | P-value | |
| Age, years | < 0.001 | 1.000 | |||||
| < 80 | 2,007 (90.7%) | 1,326 (93.6%) | 681 (85.4%) | 643 (92.1%) | 643 (92.1%) | ||
| ≥ 80 | 207 (9.3%) | 91 (6.4%) | 116 (14.6%) | 55 (7.9%) | 55 (7.9%) | ||
| Sex | 0.226 | 0.830 | |||||
| Male | 1,024 (46.3%) | 669 (47.2%) | 355 (44.5%) | 330 (47.3%) | 326 (46.7%) | ||
| Female | 1,190 (53.7%) | 748 (52.8%) | 442 (55.5%) | 368 (52.7%) | 372 (53.3%) | ||
| Year of diagnosis | < 0.001 | 0.921 | |||||
| 2000–2006 | 223 (10.1%) | 164 (11.6%) | 59 (7.4%) | 48 (6.9%) | 51 (7.3%) | ||
| 2007–2013 | 683 (30.8%) | 555 (39.2%) | 128 (16.1%) | 111 (15.9%) | 114 (16.3%) | ||
| 2014–2020 | 1,308 (59.1%) | 698 (49.3%) | 610 (76.5%) | 539 (77.2%) | 533 (76.4%) | ||
| Grade | < 0.001 | 1.000 | |||||
| I | 1,838 (83.0%) | 1,124 (79.3%) | 714 (89.6%) | 624 (89.4%) | 624 (89.4%) | ||
| II | 376 (17.0%) | 293 (20.7%) | 83 (10.4%) | 74 (10.6%) | 74 (10.6%) | ||
| T stage | < 0.001 | 0.772 | |||||
| T1 | 2,126 (96.0%) | 1,377 (97.2%) | 749 (94.0%) | 684 (98.0%) | 680 (97.4%) | ||
| T2 | 45 (2.0%) | 30 (2.1%) | 15 (1.9%) | 10 (1.4%) | 13 (1.9%) | ||
| T3 | 43 (1.9%) | 10 (0.7%) | 33 (4.1%) | 4 (0.6%) | 5 (0.7%) | ||
| Marital status | 0.534 | 0.956 | |||||
| Married | 1,322 (59.7%) | 853 (60.2%) | 469 (58.8%) | 419 (60.0%) | 420 (60.2%) | ||
| Unmarried | 892 (40.3%) | 564 (39.8%) | 328 (41.2%) | 279 (40.0%) | 278 (39.8%) | ||
| Chemotherapy | < 0.001 | 0.526 | |||||
| No/Unknown | 2,191 (99.0%) | 1,413 (99.7%) | 778 (97.6%) | 694 (99.4%) | 692 (99.1%) | ||
| Yes | 23 (1.0%) | 4 (0.3%) | 19 (2.4%) | 4 (0.6%) | 6 (0.9%) | ||
| Survival months, median (IQR) | 54.0(23.0,97.0) | 67.0(33.0,112.5) | 34.0(11.0,63.0) | < 0.001 | 40.0(20.0,67.0) | 36.5(12.0,63.3) | 0.002 |
ET endoscopic therapy, SR surgical resection, PSM propensity score matching, IQR interquartile range
Bold values indicate P < 0.05