Table 1 Descriptive statistics of predictors and outcome in the development and validation datasets

Number of patients

5909

3199

Number of centers

24

25

Number of oncology centers

13^a

15

Age (years)

47 (35–60)

49 (36–62)

Serum CA125 (U/mL)

26 (13–109)

25 (11–109)

Missing CA-125

1805 (31%)

966 (30%)

Maximal diameter of lesion (mm)

69 (48–100)

71 (50–105)

Proportion of solid tissue

0.11 (0-0.66)

0.06 (0-0.67)

Papillary projections

 0

4771 (81%)

2711 (85%)

 1

495 (8%)

200 (6%)

 2

148 (3%)

76 (2%)

 3

137 (2%)

51 (2%)

 > 3

358 (6%)

161 (5%)

> 10 cyst locules

471 (8%)

311 (12%)

Ascites

720 (12%)

321 (10%)

Shadows

742 (13%)

464 (14%)

Tumor outcome

 Benign

3980 (67%)

1988 (62%)

 Borderline

339 (6%)

259 (8%)

 Stage I invasive

356 (6%)

219 (7%)

 Stage II-IV invasive

988 (17%)

561 (18%)

 Secondary metastasis

246 (4%)

172 (5%)