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Table 5 Cohen’s linear weighted kappa values for pair-wise comparison of observers for “qualitative” evaluation

From: Inter-observer agreement improves with PERCIST 1.0 as opposed to qualitative evaluation in non-small cell lung cancer patients evaluated with F-18-FDG PET/CT early in the course of chemo-radiotherapy

Observer

A

B

C

D

E

F

G

H

B

0.57 (0.37–0.78)

       

C

0.71 (0.55–0.87)

0.74 (0.55–0.92)

      

D

0.52 (0.31–0.73)

0.66 (0.43–0.88)

0.66 (0.45–0.86)

     

E

0.67 (0.45–0.89)

0.63 (0.39–0.87)

0.76 (0.56–0.97)

0.69 (0.48–0.89)

    

F

0.68 (0.50–0.86)

0.50 (0.27–0.73)

0.64 (0.45–0.83)

0.51 (0.28–0.74)

0.67 (0.46–0.88)

   

G

0.54 (0.29–0.78)

0.76 (0.56–0.97)

0.57 (0.33–0.82)

0.75 (0.58–0.93)

0.66 (0.42–0.90)

0.53 (0.29–0.78)

  

H

0.65 (0.46–0.84)

0.74 (0.59–0.90)

0.68 (0.49–0.87)

0.61 (0.40–0.81)

0.64 (0.43–0.86)

0.52 (0.30–0.73)

0.64 (0.45–0.84)

 

Cons.

0.80 (0.66–0.95)

0.76 (0.58–0.95)

0.90 (0.79–1.01)

0.69 (0.48–0.89)

0.86 (0.68–1.05)

0.74 (0.57–0.91)

0.66 (0.42–0.90)

0.71 (0.52–0.90)

  1. Kappa (95 % confidence interval), Cons. is the consensus evaluation
  2. Observers A, D, and E (in italics) had little experience, B, F, and H had 1–2 years of experience and C and G had more than 3 years of experience