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Table 3 Intra and inter-rater reliability of the reviewers presented as percentage of agreement (PA) and Cohen´s kappa

From: Reliability of thoracolumbar burst fracture classification in the Swedish Fracture Register

 

Intra-rater reliability

Inter-rater reliability

Reviewer 1

Reviewer 2

Reviewer 1

Reviewer 2

PA

Kappa

PA

Kappa

PA

Kappa

PA

Kappa

Type A

94%

0.85 (0.09)

92%

0.93 (0.03)

96%

0.91 (0.03)

87%

0.78 (0.04)

Type A (SFR classification)

94%

0.78 (0.12)

98%

0.97 (0.03)

97%

0.86 (0.05)

92%

0.70 (0.06)

Type B

96%

0.80 (0.14)

90%

0.28 (0.16)

97%

0.92 (0.03)

99%

0.97 (0.02)

AOSpine classification

92%

0.83 (0.09)

83%

0.61 (0.12)

93%

0.93 (0.02)

86%

0.91 (0.02)

SFR classification

90%

0.81 (0.11)

88%

0.52 (0.12)

95%

0.90 (0.03)

91%

0.88 (0.03)

  1. Intra-rater reliability Comparing reviewers with themselves, Inter-rater reliability Comparing reviewers with gold standard, ASD Asymptotic standard error, PA Percentage of agreement, Type A AOSpine type A injury (A1, A2, A3, A4 or other), Type A (SFR classification) AOSpine type A injury using the SFR simplification (A1, A2, A3/4 or other), Type B AOSpine type B injury (B0, B1, B2), AOSpine classification The combined AOSpine classification of A and B injuries, SFR classification The combined AOSpine classification using the simplification where A type fractures are divided in simple compression (A1), pincer (A2) and burst (A3/4)