Table 1 Characteristics of the study population
From: A preoperative nomogram predicting risk of lymph node metastasis for early-stage cervical cancer
Variables | Training set (N = 5500) | Internal Validation set (N = 1849) | External Validation set (N = 455) |
|---|---|---|---|
Age at diagnosis | |||
< 45 years | 2870 (52.18%) | 984 (52.33%) | 171 (37.58%) |
> = 45 years | 2670 (47.82%) | 865 (46.78%) | 284 (62.42%) |
Histologic subtype | |||
Squamous | 3483 (63.33%) | 1214 (65.66%) | 414 (90.99%) |
Adenocarcinoma | 1553 (28.24%) | 495 (26.77%) | 37 (8.13%) |
Others | 464 (8.44%) | 140 ( 7.57%) | 4 (0.88%) |
Tumor grade | |||
I | 824 (14.98%) | 294 (15.90%) | 44 (9.67%) |
II | 2449 (44.53%) | 800 (43.27%) | 158 (34.73%) |
III or IV | 2227 (40.49%) | 755 (40.83%) | 253 (55.60%) |
Tumor size | |||
< 2 cm | 1956 (35.56%) | 668 (36.13%) | 148 (32.53%) |
2 ~ 4(< 4)cm | 1572 (28.58%) | 528 (28.56%) | 205 (45.05%) |
4 ~ 6(< 6)cm | 1157 (21.04%) | 373 (20.17%) | 85 (18.86%) |
> 6 cm | 815 (14.82%) | 280 (15.14%) | 17 (3.74%) |
FIGO | |||
I | 3930 (71.45%) | 1297 (70.15%) | 271 (59.56%) |
II | 1570 (28.55%) | 552 (29.85%) | 184 (40.44%) |
LNM | |||
No | 4470 (81.27%) | 1496 (80.91%) | 391 (85.93%) |
Yes | 1026 (18.65%) | 353 (19.09%) | 64 (14.07%) |