Table 1 The baseline characteristics of patients before and after PSM.
Characteristics | Before matching | P value | After matching | P value | ||
|---|---|---|---|---|---|---|
Radiotherapy + Ablation (n = 240) | Ablation (n = 6619) | Radiotherapy + Ablation (n = 240) | Ablation (n = 240) | |||
Age at diagnosis | Â | Â | 0.033 | Â | Â | 0.171 |
  ≥ 65 | 129 (53.75%) | 3095 (46.76%) |  | 129 (53.75%) | 114 (47.50%) |  |
  < 65 | 111 (46.25%) | 3524 (53.24%) |  | 111 (46.25%) | 126 (52.50%) |  |
Gender | Â | Â | 0.079 | Â | Â | 0.494 |
 Male | 189 (78.75%) | 4877 (73.68%) |  | 189 (78.75%) | 195 (81.25%) |  |
 Female | 51 (21.25%) | 1742 (26.32%) |  | 51 (21.25%) | 45 (18.75%) |  |
Years of diagnosis |  |  |  < 0.001 |  |  | 0.105 |
 2004–2009 | 23 (9.58%) | 1495 (22.59%) |  | 23 (9.58%) | 30 (12.50%) |  |
 2010–2015 | 71 (29.58%) | 2719 (41.08%) |  | 71 (29.58%) | 87 (36.25%) |  |
 2016–2019 | 146 (60.84%) | 2405 (36.33%) |  | 146 (60.84%) | 123 (51.25%) |  |
Tumor stage |  |  |  < 0.001 |  |  | 0.74 |
 Localized | 181 (75.42%) | 5822 (87.96%) |  | 181 (75.42%) | 197 (82.08%) |  |
 Regional | 59 (24.58%) | 797 (12.04%) |  | 59 (24.58%) | 43 (14.92%) |  |
AJCC stage |  |  |  < 0.001 |  |  | 0.113 |
 I | 136 (56.67%) | 4833 (73.01%) |  | 136 (56.67%) | 153 (63.75%) |  |
 II | 104 (43.33%) | 1786 (26.99%) |  | 104 (43.33%) | 87 (36.25%) |  |
Tumor size (cm) |  |  |  < 0.001 |  |  | 0.649 |
 No more than 3 | 114 (47.50%) | 4113 (62.14%) |  | 114 (47.50%) | 123 (51.25%) |  |
 3–5 | 104 (43.33%) | 2196 (33.18%) |  | 104 (43.33%) | 99 (41.25%) |  |
 Larger than 5 | 22 (9.17%) | 310 (4.68%) |  | 22 (9.17%) | 18 (7.50%) |  |
Tumor number |  |  |  < 0.001 |  |  | 0.977 |
 1 | 179 (74.58%) | 5688 (85.93%) |  | 179 (74.58%) | 180 (75.00%) |  |
 2 | 49 (20.42%) | 796 (12.03%) |  | 49 (20.42%) | 49 (20.42%) |  |
  ≥ 3 | 12 (5.00%) | 135 (2.04%) |  | 12 (5.00%) | 11 (4.58%) |  |
Ethnicity | Â | Â | 0.002 | Â | Â | 0.472 |
 White | 185 (77.08%) | 4613 (69.90%) |  | 185 (77.08%) | 191 (79.58%) |  |
 Black | 28 (11.67%) | 647 (9.77%) |  | 28 (11.67%) | 20 (8.33%) |  |
 Other | 27 (11.25%) | 1359 (20.53%) |  | 27 (11.25%) | 29 (12.09%) |  |
Marital status | Â | Â | 0.750 | Â | Â | 0.967 |
 Married | 128 (53.33%) | 3598 (54.36%) |  | 128 (53.33%) | 127 (52.92%) |  |
 Unmarried | 100 (41.67%) | 2754 (41.61%) |  | 100 (41.67%) | 102 (42.50%) |  |
 Unknown | 12 (5.00%) | 267 (4.03%) |  | 12 (5.00%) | 11 (4.58%) |  |
Chemotherapy |  |  |  < 0.001 |  |  | 0.371 |
 Yes | 77 (32.08%) | 4627 (69.90%) |  | 77 (32.08%) | 68 (28.33%) |  |
 No | 163 (67.92%) | 1992 (30.10%) |  | 163 (67.92%) | 172 (71.67%) |  |
Ablation | Â | Â | 0.489 | Â | Â | 0.566 |
 RFA | 223 (92.92%) | 6173 (93.26%) |  | 223 (92.92%) | 219 (91.25%) |  |
 Cryoablation | 2 (0.83%) | 127 (1.92%) |  | 2 (0.83%) | 5 (2.08%) |  |
 Laser ablation | 2 (0.83%) | 43 (0.65%) |  | 2 (0.83%) | 4 (1.67%) |  |
 Alcohol ablation | 13 (5.42%) | 276 (4.17%) |  | 13 (5.42%) | 12 (5.00%) |  |
