Table 1 Baseline characteristics of patients before and after PSM.
Variable | Before propensity score matching | After propensity score matching | ||||
|---|---|---|---|---|---|---|
Without radiation (1538) | With radiation (538) | P | Without radiation (300) | With radiation (300) | P | |
Age (%) | 0.002 | 0.741 | ||||
< 60 | 612 (39.8) | 256 (47.6) | 129 (43.0) | 124 (41.3) | ||
≥ 60 | 926 (60.2) | 282 (52.4) | 171 (57.0) | 176 (58.7) | ||
Sex (%) | 0.193 | 0.465 | ||||
Male | 1070 (69.6) | 391 (72.7) | 222 (74.0) | 213 (71.0) | ||
Female | 468 (30.4) | 147 (27.3) | 78 (26.0) | 87 (29.0) | ||
Race (%) | 0.053 | 0.754 | ||||
White | 1325 (86.2) | 481 (89.4) | 267 (89.0) | 175 (10.3) | ||
Black | 84 ( 5.5) | 16 ( 3.0) | 15 ( 5.0) | 12 ( 4.0) | ||
Other | 129 ( 8.4) | 41 ( 7.6) | 18 ( 6.0) | 21 ( 7.0) | ||
Marital status (%) | 0.098 | 0.383 | ||||
Married | 1016 (66.1) | 377 (70.1) | 197 (65.7) | 208 (69.3) | ||
Single/Unknown | 522 (33.9) | 161 (29.9) | 103 (34.3) | 92 (30.7) | ||
Size (%) | < 0.001 | 0.396 | ||||
< 7 cm | 381 (24.8) | 190 (35.3) | 103 (34.3) | 114 (38.0) | ||
≥ 7 cm | 1157 (75.2) | 348 (64.7) | 197 (65.7) | 186 (62.0) | ||
Grade (%) | 0.117 | 0.439 | ||||
Grade I/II | 312 (20.3) | 111 (20.6) | 53 (17.7) | 62 (20.7) | ||
Grade III | 597 (38.8) | 205 (38.1) | 121 (40.3) | 102 (34.0) | ||
Grade IV | 466 (30.3) | 146 (27.1) | 87 (29.0) | 94 (31.3) | ||
Unknown | 163 (10.6) | 76 (14.1) | 39 (13.0) | 42 (14.0) | ||
T (%) | 0.001 | 0.684 | ||||
T1 | 203 (13.2) | 103 (19.1) | 58 (19.3) | 65 (21.7) | ||
T2 | 208 (13.5) | 85 (15.8) | 44 (14.7) | 37 (12.3) | ||
T3 | 971 (63.1) | 311 (57.8) | 182 (60.7) | 178 (59.3) | ||
T4 | 156 (10.1) | 39 ( 7.2) | 16 ( 5.3) | 20 ( 6.7) | ||
N (%) | 0.103 | 0.836 | ||||
N0 | 1211 (78.7) | 442 (82.2) | 244 (81.3) | 241 (80.3) | ||
N1 | 327 (21.3) | 96 (17.8) | 56 (18.7) | 59 (19.7) | ||
Chemotherapy (%) | < 0.001 | 0.869 | ||||
No/Unknown | 778 (50.6) | 199 (37.0) | 125 (41.7) | 128 (42.7) | ||
Yes | 760 (49.4) | 339 (63.0) | 175 (58.3) | 172 (57.3) | ||
Lung metastasis(%) | < 0.001 | 0.870 | ||||
No/Unknown | 538 (35.0) | 323 (60.0) | 159 (53.0) | 1219 (71.6) | ||
Yes | 1000 (65.0) | 215 (40.0) | 141 (47.0) | 144 (48.0) | ||
Liver metastasis(%) | < 0.001 | 0.615 | ||||
No/Unknown | 1364 (88.7) | 512 (95.2) | 283 (94.3) | 279 (93.0) | ||
Yes | 174 (11.3) | 26 ( 4.8) | 17 ( 5.7) | 21 ( 7.0) | ||
Bone metastasis(%) | < 0.001 | 0.594 | ||||
No/Unknown | 1292 (84.0) | 166 (30.9) | 87 (29.0) | 94 (31.3) | ||
Yes | 246 (16.0) | 372 (69.1) | 213 (71.0) | 206 (68.7) | ||
Brain metastasis(%) | < 0.001 | 0.483 | ||||
No/Unknown | 1512 (98.3) | 411 (76.4) | 275 (91.7) | 269 (89.7) | ||
Yes | 26 ( 1.7) | 127 (23.6) | 25 ( 8.3) | 31 (10.3) | ||
