Table 1 Variance partitioning of ultrasound measurements and patient characteristics
From: Screening for data clustering in multicenter studies: the residual intraclass correlation
Variable | n | Coefficient of variation/Prevalence | VPC | R2 | RICC |
|---|---|---|---|---|---|
Patient age (years) | 2407 | 0.4 | 1.9% | 13.9% | 2.2% |
[0.8% to 3.3%] | [10.6% to 17.4%] | [0.9% to 3.7%] | |||
Number of locules (ordinal) | 1997c | 0.8 | 2.6% | 10.6% | 2.9% |
[0.5% to 4.4%] | [6.7% to 14.2%] | [0.6% to 4.9%] | |||
Maximum diameter of the solid component (mm, log transformed) | 1160b | 0.2 | 2.4% | 22.4% | 3.1% |
[0.0% to 5.7%] | [17.4% to 28.9%] | [0.0% to 7.3%] | |||
Serum CA125 (IU/L, log transformed) | 1827a | 0.4 | 2.0% | 37.8% | 3.3% |
[0.8% to 4.3%] | [32.8% to 41.7%] | [1.3% to 6.8%] | |||
Acoustic shadows (yes/no) | 2407 | 13.7% | 3.0% | 14.2% | 3.4% |
[0.0% to 5.0%] | [8.0% to 72.1%] | [0.0% to 5.9%] | |||
Number of papillations (ordinal) | 468d | 0.6 | 2.9% | 15.7% | 3.5% |
[0.0% to 5.5%] | [13.6% to 23.8%] | [0.0% to 6.6%] | |||
Maximum lesion diameter (mm, log transformed) | 2406e | 0.1 | 4.5% | 9.2% | 4.9% |
[1.0% to 10.1%] | [5.9% to 11.4%] | [1.1% to 11.0%] | |||
Presence of solid components (yes/no) | 2407 | 48.2% | 3.2% | 43.5% | 5.7% |
[1.0% to 4.4%] | [39.8% to 73.5%] | [2.3% to 8.4%] | |||
Bilateral (yes/no) | 2407 | 16.6% | 7.8% | 6.1% | 8.3% |
[0.0% to 30.0%] | [3.6% to 8.2%] | [0.0% to 31.6%] | |||
Ascites (yes/no) | 2407 | 10.0% | 4.9% | 43.0% | 8.5% |
[0.0% to 9.5%] | [34.5% to 49.3%] | [0.0% to 15.8%] | |||
Free fluid in pouch of Douglas (yes/no) | 2407 | 25.4%. | 8.3% | 14.0% | 9.6% |
[2.2% to 13.3%] | [11.1% to 17.5%] | [2.6% to 15.2%] | |||
Presence of papillations (yes/no) | 2407 | 19.6% | 8.7% | 11% | 9.8% |
[3.7% to 12.9%] | [7.4% to 14.9%] | [4.1% to 14.8%] | |||
Irregular internal wall (yes/no) | 2407 | 38.5% | 10.0% | 13.8% | 11.6% |
[2.7% to 16.7%] | [11.6% to 16.7%] | [3.1% to 19.5%] | |||
Peak systolic velocity (cm/s, log transformed) | 1432g | 0.3 | 11.2% | 5.9% | 11.9% |
[5.3% to 16.3%] | [2.4% to 10.8%] | [6.0% to 16.9%] | |||
Metastases (yes/no) | 1457f | 10.7% | 5.3% | 57.9% | 12.6% |
[0.2% to 8.4%] | [52.9% to 95.3%] | [1.3% to 21.1%] | |||
Height of papillation (mm, log transformed) | 468d | 0.3 | 10.9% | 16.7% | 13.1% |
[0.0% to 28.2%] | [6.3% to 25.5%] | [0.0% to 31.7%] | |||
Resistance index | 1432g | 0.3 | 14.5% | 8.4% | 15.9% |
[1.7% to 23.6%] | [4.6% to 13.5%] | [1.9% to 26.5%] | |||
Papillations with detectable blood flow (yes/no) | 468d | 47.4% | 11.3% | 30.4% | 16.2% |
[2.8% to 17.1%] | [25.6% to 41.2%] | [4.4% to 23.8%] | |||
Color score of intratumoral blood flow (ordinal) | 2407 | 0.5 | 12.2% | 30.9% | 17.6% |
[3.6% to 22.6%] | [24.9% to 36.3%] | [5.6% to 30.1%] | |||
Pelvic pain during examination (yes/no) | 2407 | 19.1% | 18.6% | 1.5% | 18.9% |
[6.6% to 26.5%] | [0.9% to 9.4%] | [9.8% to 27.1%] | |||
Personal history of ovarian cancer (yes/no) | 2407 | 1.6% | 16.5% | 13.1% | 19.0% |
[0.0% to 25.3%] | [10.3% to 72.8%] | [0.0% to 30.3%] | |||
Current use of hormonal therapy (yes/no) | 2407 | 12.7% | 19.5% | 2.6% | 20.0% |
[10.0% to 30.4%] | [1.3% to 9.0%] | [10.6% to 31.2%] | |||
Amount of free fluid in pouch of Douglas (mm, log transformed) | 616h | 0.3 | 21.2% | 15.5% | 25.1% |
[5.1% to 28.4%] | [9.8% to 21.7%] | [6.7% to 32.1%] |