Table 1.
Patient characteristics before PSM: comparison between pre- and post-surgery radiation groups
| Variable | Total (n = 1007) | Radiation after surgery (n = 591) | Radiation before surgery (n = 416) | Statistic | P | SMD |
|---|---|---|---|---|---|---|
| LNP, Mean ± SD | 0.17 ± 2.48 | 0.11 ± 0.32 | 0.26 ± 3.83 | t=– 0.963 | 0.336 | 0.040 |
| Tumor size, Mean ± SD | 3.06 ± 1.03 | 2.93 ± 1.05 | 3.19 ± 1.02 | t=– 1.964 | 0.035 | 0.631 |
| Age, n (%) | χ²=9.260 | 0.002 | ||||
| <65 | 913 (90.67) | 522 (88.32) | 391 (93.99) | 0.238 | ||
| ≥65 | 94 (9.33) | 69 (11.68) | 25 (6.01) | -0.238 | ||
| Race, n (%) | – | 0.140 | ||||
| Black | 104 (10.33) | 62 (10.49) | 42 (10.10) | -0.013 | ||
| Other | 136 (13.51) | 72 (12.18) | 64 (15.38) | 0.089 | ||
| Unknown | 5 (0.5) | 5 (0.85) | 0 (0.00) | -0.121 | ||
| White | 762 (75.67) | 452 (76.48) | 310 (74.52) | -0.045 | ||
| Sex, n (%) | χ²=3.667 | 0.05 | ||||
| Female | 467 (46.38) | 289 (48.90) | 178 (42.79) | -0.124 | ||
| Male | 540 (53.62) | 302 (51.10) | 238 (57.21) | 0.124 | ||
| Grade, n (%) | χ²=16.622 | 0.002 | ||||
| Grade I | 36 (3.57) | 28 (4.74) | 8 (1.92) | – 0.205 | ||
| Grade II | 88 (8.74) | 48 (8.12) | 40 (9.62) | 0.051 | ||
| Grade III | 163 (16.19) | 95 (16.07) | 68 (16.35) | 0.007 | ||
| Grade IV | 148 (14.7) | 69 (11.68) | 79 (18.99) | 0.187 | ||
| Unknown | 572 (56.8) | 351 (59.39) | 221 (53.12) | – 0.126 | ||
| T, n (%) | χ²=8.196 | 0.005 | ||||
| T1 | 21 (2.09) | 10 (1.69) | 11 (2.64) | 0.059 | ||
| T2 | 948 (94.14) | 566 (95.77) | 382 (91.83) | – 0.144 | ||
| T3 | 16 (1.59) | 6 (1.02) | 10 (2.40) | 0.091 | ||
| T4 | 10 (0.99) | 3 (0.51) | 7 (1.68) | 0.091 | ||
| TX | 12 (1.19) | 6 (1.02) | 6 (1.44) | 0.036 | ||
| N, n (%) | χ²=0.094 | 0.760 | ||||
| N0 | 1004 (99.7) | 590 (99.83) | 414 (99.52) | – 0.045 | ||
| N1 | 3 (0.3) | 1 (0.17) | 2 (0.48) | 0.045 | ||
| M, n (%) | χ²=0.102 | 0.749 | ||||
| M0 | 995 (98.81) | 585 (98.98) | 410 (98.56) | – 0.036 | ||
| M1 | 12 (1.19) | 6 (1.02) | 6 (1.44) | 0.036 | ||
| Chemotherapy, n (%) | χ²=5.801 | 0.016 | ||||
| No | 684 (67.92) | 419 (70.90) | 265 (63.70) | – 0.150 | ||
| Yes | 323 (32.08) | 172 (29.10) | 151(36.30) | 0.150 | ||
| Marital, n (%) | χ²=35.859 | < 0.001 | ||||
| Divorced | 43 (4.27) | 24 (4.06) | 19 (4.57) | 0.024 | ||
| Married | 358 (35.55) | 169 (28.60) | 189 (45.43) | 0.338 | ||
| Separated | 2 (0.2) | 1 (0.17) | 1 (0.24) | 0.015 | ||
| Single | 521 (51.74) | 337 (57.02) | 184 (44.23) | – 0.258 | ||
| Unknown | 37 (3.67) | 30 (5.08) | 7 (1.68) | – 0.264 | ||
| Widowed | 46 (4.57) | 30 (5.08) | 16 (3.85) | – 0.064 |