Table 1 Characteristics of patients in the training and validation dataset
Characteristic | Training dataset | Validation dataset | P | ||||
|---|---|---|---|---|---|---|---|
Total | Cervical LN Metastasis | Total | Cervical LN Metastasis | ||||
(−) (n = 108) | (+) (n = 36) | (−) (n = 68) | (+) (n = 23) | ||||
Gender, No. (%) | 0.26 | ||||||
 Male | 100 (69.4) | 75 (69.4) | 25 (69.4) | 56 (61.6) | 38 (55.9) | 18 (78.3) |  |
 Female | 44 (30.6) | 33 (30.6) | 11 (30.6) | 35 (38.5) | 30 (44.1) | 5 (22.7) |  |
Age, median (IQR), years | 62 (58.5, 65.5) | 62.5 (58.5, 66) | 61.5 (58, 64.5) | 62 (58, 67) | 62.5 (58.5, 67) | 60 (54, 65) | 0.69 |
Tumor location, No. (%) | 0.75 | ||||||
 Middle | 111 (77.1) | 80 (74.1) | 31 (86.1) | 68 (74.7) | 52 (76.5) | 16 (69.6) |  |
 Lower | 33 (22.9) | 28 (25.9) | 5 (13.9) | 23 (25.3) | 16 (23.5) | 7 (30.4) |  |
Degree of differentiation, No. (%) | 0.44 | ||||||
 Well | 18 (12.5) | 14 (13.0) | 4 (11.1) | 17 (18.7) | 16 (23.5) | 1 (4.3) |  |
 Moderate | 85 (59.0) | 62 (57.4) | 23 (63.9) | 51 (56.0) | 37 (54.4) | 14 (60.9) |  |
 Poorly | 41 (28.5) | 32 (29.6) | 9 (25.0) | 23 (25.3) | 15 (22.1) | 8 (34.8) |  |
Maximum diameter of tumor, median (IQR), cm | 3.5 (2.5, 5) | 3.5 (2.45,4.5) | 4.25 (3, 5.75) | 3 (2, 4) | 3 (2, 4) | 4 (3, 5) | 0.12 |
Depth of tumor invasion, No. (%) | 0.37 | ||||||
 T1 | 32 (22.2) | 29 (26.9) | 3 (8.3) | 28 (30.8) | 27 (39.7) | 1 (4.3) |  |
 T2 | 23 (16.0) | 18 (16.7) | 5 (13.9) | 17 (18.7) | 15 (22.1) | 2 (8.7) |  |
 T3 | 71 (49.3) | 50 (46.3) | 21 (58.3) | 38 (41.8) | 22 (32.4) | 16 (69.6) |  |
 T4 | 18 (12.5) | 11 (10.2) | 7 (19.4) | 8 (8.8) | 4 (5.9) | 4 (17.4) |  |
PLN status No. (%) | 0.15 | ||||||
 Negative | 115 (79.9) | 94 (87.0) | 21 (58.3) | 80 (87.9) | 64 (94.1) | 16 (69.6) |  |
 Positive | 29 (20.1) | 14 (13.0) | 15 (41.7) | 11 (12.1) | 4 (5.9) | 7 (30.4) |  |
MLN status No. (%) | 0.85 | ||||||
 Negative | 122 (84.7) | 97 (89.8) | 25 (69.4) | 76 (83.5) | 64 (94.1) | 12 (52.2) |  |
 Positive | 22 (15.3) | 11 (10.2) | 11 (30.6) | 15 (16.5) | 4 (5.9) | 11 (47.8) |  |
RLN LN status No. (%) | 0.48 | ||||||
 Negative | 93 (64.6) | 80 (74.1) | 13 (36.1) | 63 (69.2) | 55 (80.9) | 8 (34.8) |  |
 Positive | 51 (35.4) | 28 (25.9) | 23 (63.9) | 28 (30.8) | 13 (19.1) | 15 (65.2) |  |
ALN status No. (%) | 0.56 | ||||||
 Negative | 99 (68.8) | 75 (69.4) | 24 (66.7) | 66 (72.5) | 56 (82.4) | 10 (43.5) |  |
 Positive | 45 (31.3) | 33 (30.6) | 12 (33.3) | 25 (27.5) | 12 (17.6) | 13 (56.5) |  |
Blood vessel invasion, No. (%) | 0.84 | ||||||
 Negative | 128 (88.9) | 99 (91.7) | 29 (80.6) | 80 (87.9) | 64 (94.1) | 16 (69.6) |  |
 Positive | 16 (11.1) | 9 (8.3) | 7 (19.4) | 11 (12.1) | 4 (5.9) | 7 (30.4) |  |
Nerve invasion, No. (%) | 0.86 | ||||||
 Negative | 121 (84.0) | 93 (86.1) | 28 (77.8) | 75 (82.4) | 59 (86.8) | 16 (69.6) |  |
 Positive | 23 (16.0) | 15 (13.9) | 8 (22.2) | 16 (17.6) | 9 (13.2) | 7 (30.4) |  |
CT-reported cervical LN status, No. (%) | 0.63 | ||||||
 Negative | 113 (78.5) | 91 (84.3) | 22 (61.1) | 69 (75.8) | 55 (80.9) | 14 (60.9) |  |
 Positive | 31 (21.5) | 17 (15.7) | 14 (38.9) | 22 (24.2) | 13 (19.1) | 9 (39.1) |  |