Table S1.
Patient characteristics according to the administration of PORT before and after PSM
| Characteristics | Before PSM
|
After PSM
|
|||||
|---|---|---|---|---|---|---|---|
| PORT(−) (n=83) | PORT(+) (n=143) | P-value | PORT(−) (n=76) | PORT(+) (n=76) | P-value | ||
|
| |||||||
| Race (%) | White | 65 (78.3) | 108 (75.5) | 0.621 | 62 (81.6) | 58 (76.3) | 0.726 |
| Black | 7 (8.4) | 18 (12.6) | 6 (7.9) | 8 (10.5) | |||
| Others | 11 (13.3) | 17 (11.9) | 8 (10.5) | 10 (13.2) | |||
| Sex (%) | Female | 44 (53.0) | 70 (49.0) | 0.652 | 40 (52.6) | 39 (51.3) | 1.000 |
| Male | 39 (47.0) | 73 (51.0) | 36 (47.4) | 37 (48.7) | |||
| Year of diagnosis (%) | 1988–1999 | 16 (19.3) | 34 (23.8) | 0.719 | 16 (21.1) | 16 (21.1) | 0.655 |
| 2000–2009 | 41 (49.4) | 65 (45.5) | 36 (47.4) | 31 (40.8) | |||
| 2010–2015 | 26 (31.3) | 44 (30.8) | 24 (31.6) | 29 (38.2) | |||
| CHSDA region (%) | East | 23 (27.7) | 42 (29.4) | 0.696 | 19 (25.0) | 20 (26.3) | 0.725 |
| NP | 12 (14.5) | 24 (16.8) | 38 (50.0) | 33 (43.4) | |||
| PC | 40 (48.2) | 69 (48.3) | 12 (15.8) | 17 (22.4) | |||
| SW | 8 (9.6) | 8 (5.6) | 7 (9.2) | 6 (7.9) | |||
| Histology (%) | SCC | 16 (19.3) | 48 (33.6) | <0.001 | 16 (21.1) | 14 (18.4) | 0.056 |
| ACC | 22 (26.5) | 63 (44.1) | 22 (28.9) | 36 (47.4) | |||
| Others | 45 (54.2) | 32 (22.4) | 38 (50.0) | 26 (34.2) | |||
| E stage (%) | E1 | 59 (71.1) | 74 (51.7) | 0.013 | 52 (68.4) | 49 (64.5) | 0.731 |
| E2 | 24 (28.9) | 67 (46.9) | 24 (31.6) | 27 (35.5) | |||
| E3 | 0 (0.0) | 2 (1.4) | 0 | 0 | |||
| N stage (%) | N0 | 78 (94.0) | 111 (77.6) | 0.003 | 71 (93.4) | 69 (90.8) | 0.764 |
| N1 | 5 (6.0) | 32 (22.4) | 5 (6.6) | 7 (9.2) | |||
| M stage (%) | M0 | 78 (94.0) | 134 (93.7) | 1.000 | 72 (94.7) | 70 (92.1) | 0.744 |
| M1 | 5 (6.0) | 9 (6.3) | 4 (5.3) | 6 (7.9) | |||
| Tumor size (%) | ≤3.9 cm | 51 (75.0) | 99 (86.1) | 0.092 | 47 (74.6) | 52 (83.9) | 0.271 |
| >3.9 cm | 17 (25.0) | 16 (13.9) | 16 (25.4) | 10 (16.1) | |||
| Unknown | 15 | 28 | 13 | 14 | |||
| Marital status (%) | No | 40 (50.6) | 50 (36.0) | 0.049 | 39 (53.4) | 42 (58.3) | 0.617 |
| Yes | 39 (49.4) | 89 (64.0) | 34 (46.6) | 30 (41.7) | |||
| Unknown | 4 | 4 | 3 | 4 | |||
| Age (mean [SD]) | 55.07 (19.66) | 56.41 (14.42) | 0.559 | 55.75 (19.14) | 56.41 (15.22) | 0.815 | |
Abbreviations: ACC, adenoid cystic carcinoma; CHSDA, Contract Health Service Delivery Areas; NP, Northern Plains; PC, Pacific Coast; PORT, postoperative radiotherapy; PSM, propensity score matching; SCC, squamous cell carcinoma; SW, Southwest.