Characteristics of the two groups: OMT/LN versus non-OMT/LN
| Parameter | OMT/LN group (n=190) | non-OMT/LN group (n=55) | P value |
| Median age (range), years | 24.8 (9-61） | 22.5 (5-40） | 0.080 |
| FIGO Stage, (%) | 0.855 | ||
| I | 167 (87.9) | 49 (89.1) | - |
| II | 22 (11.6) | 6 (10.9) | - |
| III A | 1 (0.5) | 0 (0.0) | - |
| Histopathology, (%) | 0.837 | ||
| YST | 48 (25.3) | 12 (21.8) | - |
| DSG | 56 (29.5) | 18 (32.7) | - |
| IMT | 86 (45.3) | 25 (45.5) | - |
| Surgical style, (%) | 0.003 | ||
| Hysterectomy | 49 (25.8) | 4 (7.3) | - |
| Fertility-sparing | 141 (74.2) | 51 (92.7) | - |
| Surgical route, (%) | 0.424* | ||
| Laparotomy | 171 (90.0) | 52 (94.5) | - |
| Laparoscopy | 19 (10.0) | 3 (5.5) | - |
| Operation time (min) | 160.2 (45-450, n=166） | 116.0 (45-265，n=25） | <0.001 |
| Blood loss (ml) | 160.8(10-3500, n=159） | 163.8 (5-3000，n=25） | 0.971 |
| Adjuvant chemotherapy, (%) | 165 (86.8) | 49 (89.1) | 0.659 |
| Platinum-based | 157 (82.6) | 47 (85.5) | 1.000* |
| Without platinum | 8 (4.2) | 2 (3.6) | - |
| Without chemotherapy, (%) | 25 (13.2) | 6 (10.9) | - |
*Fisher exact test
DSG, dysgerminoma; FIGO, International Federation of Obstetrics and Gynecology; IMT, immature teratoma; LN, lymphadenectomy; OMT, omentectomy; YST, yolk sac tumor.