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Table 2 Intra- and interobserver agreement of dark-field and transmission signal grading

From: Imaging features in post-mortem x-ray dark-field chest radiographs and correlation with conventional x-ray and CT

  Reader 1 Reader 2 Reader 3
Intraobserver agreement (κ values)
 Dark-field signal 0.959 0.971 0.793
 Transmission 0.907 0.918 0.790
Interobserver agreement (κ values)
 Dark-field signal
  Reader 1 0.848 0.828
  Reader 2 0.848 0.893
  Reader 3 0.828 0.893
 Transmission
  Reader 1 0.772 0.744
  Reader 2 0.772 0.700
  Reader 3 0.744 0.700
  1. Visual grading of dark-field signal and transmission shows substantial (weighted Cohen κ = 0.61–0.80) to almost perfect (κ = 0.81–1.00) intraobserver and interobserver agreement, according to Landis and Koch [29]. Time difference between reading sessions for assessment of intraobserver agreement was 4 weeks