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Table 4 Interobserver and intraobserver reliability

From: A novel MRI index for paraspinal muscle fatty infiltration: reliability and relation to pain and disability in lumbar spinal stenosis: results from a multicentre study

Reliability MFI GCS
ICC (95% CI) AC1 (95% CI)
Interobserver 0.79 (0.70, 0.85) 0.33 (0.27, 0.39)
Intraobserver
 Observer 1 0.91 (0.89, 0.92) 0.92 (0.89, 0.95)
 Observer 2 0.86 (0.74, 0.91) 0.64 (0.59, 0.70)
 Observer 3 0.91 (0.89, 0.93) 0.55 (0.49, 0.60)
  1. AC1 Gwet’s agreement coefficient, CI Confidence interval, GCS Goutallier classification system, ICC Intraclass correlation coefficient, MFI Muscle fat index