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Table 2 Effect of ultrasound machine quality on differences between physicians

From: Screening for data clustering in multicenter studies: the residual intraclass correlation

Variable

n

Reduction in RICC

Number of locules (ordinal)

1997c

0.3%

[-0.1% to 1.2%]

Maximum diameter of the solid component (mm, log transformed)

1160b

-0.5%

[-1.1% to 1.1%]

Acoustic shadows (yes/no)

2407

-0.4%

[-3.6% to 0.9%]

Number of papillations (ordinal)

468d

3.1%

[-0.0% to 6.2%]

Maximum lesion diameter (mm, log transformed)

2406e

0.2%

[-0.6% to 2.8%]

Presence of solid components (yes/no)

2407

0.7%

[-0.3% to 2.6%]

Bilateral (yes/no)

2407

-1.2%

[-3.7% to 2.1%]

Ascites (yes/no)

2407

3.6%

[-0.8% to 10.8%]

Free fluid in pouch of Douglas (yes/no)

2407

0.6%

[-0.5% to 3.1%]

Presence of papillations (yes/no)

2407

2.5%

[0.2% to 6.3%]

Irregular internal wall (yes/no)

2407

1.0%

[-0.5% to 4.1%]

Peak systolic velocity (cm/s, log transformed)

1432g

4.0%

[-0.5% to 9.4%]

Metastases (yes/no)

1457f

0.9%

[-1.3% to 6.5%]

Height of papillation (mm, log transformed)

468d

0.1%

[-2.9% to 8.8%]

Resistance index

1432g

5.6%

[-1.3% to 19.2%]

Papillations with detectable blood flow (yes/no)

468d

2.7%

[-1.5% to 12.8%]

Color score of intratumoral blood flow (ordinal)

2407

-0.4%

[-2.2% to 1.5%]

Amount of free fluid in pouch of Douglas (mm, log transformed)

616h

0.8%

[-0.9% to 3.9%]

  1. Difference in RICC [90% CI]. bIf at least one solid component is present; cIf there is at least one locul; dIn case of the presence of a papillary structure; eOne influential outlier removed (measurement error); fAssessment of presence of metastases was not obligatory; gIf there is intratumoural blood flow; hIf there is fluid in the pouch of Douglas.