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Table 11 Surgery Invasiveness Scoring: Inter-rater agreement for procedure invasiveness measurements for 50 consecutive operations coded by the treating surgeon and two researchers.

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

Procedure Characteristic Researchers1 Surgeons2
  ICC (95%CI) ICC (95%CI)
Invasiveness Index 0.998 (0.997 to 0.999) 0.995 (0.993 to 0.997)
Anterior decompression 0.995 (0.992 to 0.997) 0.872 (0.814 to 0.920)
Anterior fusion 0.992 (0.988 to 0.995) 0.912 (0.872 to 0.945)
Anterior instrumentation 0.994 (0.991 to 0.996) 0.923 (0.887 to 0.951)
Posterior decompression 1.000 0.992 (0.989 to 0.995)
Posterior fusion 0.999 (0.999 to 1.000) 1.000
Posterior instrumentation 1.000 0.996 (0.994 to 0.997)
  1. 1Intraclass correlation coefficients for agreement between the two researchers: surgeon-investigator and a trained research assistant.
  2. 2Intraclass correlation coefficients for agreement between the treating surgeon and the researchers.