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Table 10 Disease Severity Scoring: Agreement between and within observers for 9 imaging disease characteristics for 10 patients. Each observer scored each case initially and then again approximately three weeks later.

From: Towards standardized measurement of adverse events in spine surgery: conceptual model and pilot evaluation

Imaging Dimension Observer 1 vs 2 1 Observer 1 2 Observer 2 3
1. Degeneration 0.70 0.72 0.85
2. Height Loss 0.44 0.49 0.63
3. Osteophytes 0.47 0.53 0.67
4. Herniation 0.28 0.61 0.41
5. Stenosis 0.44 0.37 0.56
6. Listhesis 0.54 0.64 0.83
7. Instability 0.38 -0.02 1.00
8. Scoliosis Magnitude 0.51 1.00 0.58
9. Kyphosis Magnitude 0.42 0.62 0.62
Mean 0.45 0.58 0.67
  1. 1 Kappa value for inter-observer agreement between Observer 1 and Observer 2.
  2. 2 Kappa value for intra-observer agreement for Observer 1.
  3. 3 Kappa value for intra-observer agreement for Observer 2.