Table 2 Inter-reader agreement for diagnosing cysts according to combinations of imaging sequences.

From: Inter-reader agreement for diagnosing thymic cysts on chest MRI in two tertiary referral centers

 

Three-category scale

p-values comparing sessions

Two-category scale

p-values comparing sessions

Institution A

 

vs. Session 2

vs. Session 3

vs. Session 4

 

vs. Session 2

vs. Session 3

vs. Session 4

 Session 1

0.46 (0.31, 0.61)

0.617

0.550

0.431

0.53 (0.35, 0.71)

0.916

0.649

0.763

 Session 2

0.42 (0.27, 0.57)

–

0.076

0.060

0.52 (0.35, 0.69)

–

0.297

0.769

 Session 3

0.51 (0.33, 0.69)

–

–

0.699

0.57 (0.38, 0.77)

–

–

0.312

 Session 4

0.53 (0.35, 0.71)

–

–

–

0.50 (0.31, 0.69)

–

–

–

Institution B

 

vs. Session 6

   

vs. Session 6

  

 Session 5a

0.37 (0.04, 0.69)

0.227

  

0.48 (0.05, 0.91)

0.241

  

 Session 6a

0.53 (0.15, 0.91)

–

  

0.74 (0.28, 1.00)

–

  
  1. Data are Fleiss’ κ coefficients for overall categorization (three-category scale; cyst vs. indeterminate vs. non-cyst) and discriminating cysts from non-cysts (two-category scale); Data in parentheses are 95% confidence intervals. ADC = apparent diffusion coefficient, DWI = diffusion-weighted imaging.
  2. Session 1 = T2WI + pre- and post-contrast T1WI + DWI/ADC map.
  3. Session 2 = T2WI + pre- and post-contrast T1WI + subtracted image.
  4. Session 3 = T2WI + pre- and post-contrast T1WI + DWI/ADC map + subtracted image.
  5. Session 4 = T2WI + pre- and post-contrast T1WI + DWI/ADC map + subtracted image + pre- and post-contrast CT.
  6. Session 5 = T2WI + pre- and post-contrast T1WI + DWI/ADC map + subtracted image.
  7. Session 6 = T2WI + pre- and post-contrast T1WI + DWI/ADC map + subtracted image + pre- and post-contrast CT.
  8. aAmong the three readers (Reader 1, Reader 2, and Reader 4).
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