Table 2. Patient, tumor, and treatment characteristics before and after propensity score matching.
| Variables | Before Propensity Score Matching | After Propensity Score Matching | ||||
|---|---|---|---|---|---|---|
| PORT (+) (N = 420) | PORT (−) (N = 280) | P | PORT (+) (N = 262) | PORT (−) (N = 262) | P | |
| Age | ||||||
| <40 | 47(11.2) | 32(11.4) | 0.009** | 25(9.5) | 29(11.1) | 0.19 |
| 40–49 | 69(16.4) | 41(14.6) | 33(12.6) | 38(14.5) | ||
| 50–59 | 106(25.2) | 48(17.2) | 64(24.4) | 46(17.5) | ||
| 60–69 | 117(27.9) | 75(26.8) | 80(30.6) | 72(27.5) | ||
| ≥70 | 81(19.3) | 84(30.0) | 60(22.9) | 77(29.4) | ||
| gender | ||||||
| Men | 219(52.1) | 130(46.4) | 0.139 | 127(48.5) | 123(46.9) | 0.726 |
| Women | 201(47.9) | 150(53.6) | 135(51.5) | 139(53.1) | ||
| Race | ||||||
| White | 282(67.2) | 188(67.1) | 0.804 | 181(69.1) | 182(69.5) | 0.587 |
| Black | 51(12.1) | 40(14.3) | 30(11.4) | 36(13.7) | ||
| Others | 79(18.8) | 47(16.8) | 51(19.5) | 44(16.8) | ||
| Unknown | 8(1.9) | 5(1.8) | ||||
| Marital status | ||||||
| Married | 262(62.4) | 177(63.2) | 0.974 | 150(57.3) | 152(58.0) | 0.860 |
| Not married | 147(35.0) | 96(34.3) | 112(42.7) | 110(42.0) | ||
| Unknown | 11(2.6) | 7(2.5) | ||||
| Tumor extent | ||||||
| Adjacent connective tissue | 176(41.9) | 117(41.8) | 0.975 | 129(49.2) | 111(42.4) | 0.115 |
| Adjacent organs or structures | 244(58.1) | 163(58.2) | 133(50.8) | 151(57.6) | ||
| Lymph node status | ||||||
| Negative | 379(90.3) | 254(90.7) | 0.978 | 247(94.3) | 252(96.2) | 0.305 |
| Positive | 19(4.5) | 12(4.3) | 15(5.7) | 10(3.8) | ||
| Unknown | 22(5.2) | 14(5.0) | ||||
| Extent of surgery | ||||||
| Radical surgery | 119(28.3) | 70(25.0) | 0.047 | 69(26.3) | 64(24.5) | 0.157 |
| Total resection | 186(44.3) | 130(46.4) | 116(44.3) | 125(47.7) | ||
| Simple or partial resection | 97(23.1) | 77(27.5) | 66(25.2) | 70(26.7) | ||
| Debulking surgery | 18(4.3) | 3(1.1) | 11(4.2) | 3(1.1) | ||
Abbreviations: PORT, postoperative radiotherapy.