Table 1 Comparison of baseline characteristics before and after propensity score matching.
Variables | Unmatched | Matched | |||||
|---|---|---|---|---|---|---|---|
Level | Non-Chemo | Chemo | P-value | Non-Chemo | Chemo | P-value | |
Number | 619 | 1165 | 492 | 492 | |||
Age (median [IQR]) | 72.000 [66.000, 77.000] | 67.000 [60.000, 72.000] | < 0.0001 | 72.000 [65.000, 77.000] | 69.000 [63.000, 73.000] | < 0.0001 | |
Age level (%) | < 60 | 53 (8.56) | 279 (23.95) | < 0.0001 | 50 (10.16) | 50 (10.16) | 1 |
≥ 60 | 566 (91.44) | 886 (76.05) | 442 (89.84) | 442 (89.84) | |||
Sex (%) | Female | 221 (35.70) | 381 (32.70) | 0.2215 | 175 (35.57) | 172 (34.96) | 0.8938 |
Male | 398 (64.30) | 784 (67.30) | 317 (64.43) | 320 (65.04) | |||
Race (%) | White | 537 (86.75) | 984 (84.46) | 0.3947 | 426 (86.59) | 416 (84.55) | 0.6626 |
Black | 53 (8.56) | 112 (9.61) | 39 (7.93) | 45 (9.15) | |||
Others | 29 (4.68) | 69 (5.92) | 27 (5.49) | 31 (6.30) | |||
Marital status (%) | Unmarried | 67 (10.82) | 148 (12.70) | 0.0323 | 58 (11.79) | 57 (11.59) | 0.8226 |
Married | 358 (57.84) | 718 (61.63) | 288 (58.54) | 280 (56.91) | |||
W/D/S | 194 (31.34) | 299 (25.67) | 146 (29.67) | 155 (31.50) | |||
Primary site (%) | Upper lobe | 303 (48.95) | 677 (58.11) | 0.0001 | 252 (51.22) | 263 (53.46) | 0.8695 |
Lower lobe | 226 (36.51) | 386 (33.13) | 186 (37.80) | 177 (35.98) | |||
Middle lobe | 28 (4.52) | 41 (3.52) | 20 (4.07) | 17 (3.46) | |||
Others | 62 (10.02) | 61 (5.24) | 34 (6.91) | 35 (7.11) | |||
Laterality (%) | Left | 263 (42.49) | 553 (47.47) | 0.05 | 223 (45.33) | 231 (46.95) | 0.6544 |
Right | 356 (57.51) | 612 (52.53) | 269 (54.67) | 261 (53.05) | |||
Grade (%) | I | 15 (2.42) | 21 (1.80) | 0.239 | 8 (1.63) | 9 (1.83) | 0.9244 |
II | 250 (40.39) | 470 (40.34) | 194 (39.43) | 194 (39.43) | |||
III | 345 (55.74) | 667 (57.25) | 286 (58.13) | 283 (57.52) | |||
IV | 9 (1.45) | 7 (0.60) | 4 (0.81) | 6 (1.22) | |||
Tumor size (%) | ≤ 3 cm | 186 (30.05) | 265 (22.75) | 0.0001 | 126 (25.61) | 134 (27.24) | 0.8836 |
> 7 cm | 137 (22.13) | 249 (21.37) | 122 (24.80) | 114 (23.17) | |||
3–5 cm | 193 (31.18) | 363 (31.16) | 152 (30.89) | 148 (30.08) | |||
5–7 cm | 103 (16.64) | 288 (24.72) | 92 (18.70) | 96 (19.51) | |||
T stage (%) | T1 | 55 (8.89) | 119 (10.21) | < 0.0001 | 45 (9.15) | 49 (9.96) | 0.8105 |
T2 | 123 (19.87) | 351 (30.13) | 118 (23.98) | 119 (24.19) | |||
T3 | 216 (34.89) | 415 (35.62) | 186 (37.80) | 194 (39.43) | |||
T4 | 225 (36.35) | 280 (24.03) | 143 (29.07) | 130 (26.42) | |||
N stage (%) | N0 | 163 (26.33) | 117 (10.04) | < 0.0001 | 83 (16.87) | 71 (14.43) | 0.7701 |
N1 | 188 (30.37) | 305 (26.18) | 162 (32.93) | 165 (33.54) | |||
N2 | 259 (41.84) | 722 (61.97) | 239 (48.58) | 248 (50.41) | |||
N3 | 9 (1.45) | 21 (1.80) | 8 (1.63) | 8 (1.63) | |||
Surgery methods (%) | Resection of lobe or bilobectomy | 369 (59.61) | 781 (67.04) | 0.0001 | 313 (63.62) | 319 (64.84) | 0.9106 |
Others | 124 (20.03) | 148 (12.70) | 74 (15.04) | 70 (14.23) | |||
Pneumonectomy | 126 (20.36) | 236 (20.26) | 105 (21.34) | 103 (20.93) | |||
Radiation therapy (%) | No | 531 (85.78) | 541 (46.44) | < 0.0001 | 404 (82.11) | 403 (81.91) | 1 |
Yes | 88 (14.22) | 624 (53.56) | 88 (17.89) | 89 (18.09) | |||
