Table 4.
Descriptive statistics for patients in primary analysis (n=4905)
| Variable | Median (IQR) range, or No (%) |
|---|---|
| Patient age at recruitment (years) | 48 (36-62), 18-98 |
| Postmenopausal | 2151 (44) |
| Gynaecological symptoms during the year preceding inclusion | 2565 (52) |
| Bilateral masses | 829 (17) |
| Tumour type using IOTA terminology | |
| Unilocular | 2140 (44) |
| Unilocular solid | 396 (8) |
| Multilocular | 1011 (21) |
| Multilocular solid | 649 (13) |
| Solid | 689 (14) |
| Not possible to classify | 20 (0.4) |
| Presence of solid components | 1734 (35) |
| Maximum diameter of lesion (mm) | 55 (38-83), 7-751 |
| Colour score of intratumoural flow | |
| 1: no blood flow | 2031 (41) |
| 2: minimal blood flow | 1336 (27) |
| 3: moderate blood flow | 1099 (22) |
| 4: very strong flow | 439 (9) |
| Ultrasound examiner’s presumed diagnosis: any benign diagnosis | 3673 (75) |
| Serous cystadenoma/serous cystadenofibroma | 791 (16) |
| Endometrioma | 742 (15) |
| Simple cyst/para-ovarian or salpingeal cyst | 628 (13) |
| Teratoma | 532 (11) |
| Mucinous cystadenoma/mucinous cystadenofibroma | 281 (6) |
| Fibroma/fibrothecoma | 216 (4) |
| Functional cyst | 184 (4) |
| Hydrosalpinx | 156 (3) |
| Abcess/salpingitis/pelvic inflammatory disease | 88 (2) |
| Inclusion cyst/peritoneal cyst | 36 (1) |
| Benign rare tumour | 19 (0.4) |
| Ultrasound examiner’s presumed diagnosis: any borderline diagnosis | 263 (5) |
| Borderline malignant tumour | 218 (4) |
| Mucinous borderline tumour of intestinal type | 39 (1) |
| Mucinous borderline tumour of endocervical type | 6 (0.1) |
| Ultrasound examiner’s presumed diagnosis: any diagnosis of invasive malignancy | 805 (16) |
| Primary ovarian cancer | 598 (12) |
| Metastasis to the ovary | 110 (2) |
| Malignant rare tumour | 97 (2) |
| Ultrasound examiner’s presumed diagnosis: not possible | 164 (3) |
IOTA=International Ovarian Tumour Analysis; IQR=interquartile range.