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Table 4 Interobserver variability of ISS, NISS and MAIS

From: Interobserver variability of injury severity assessment in polytrauma patients: does the anatomical region play a role?

Observers ISS (95% CI) NISS (95% CI) MAIS (95% CI)
Overall 0.33 (0.23–0.42) 0.23 (0.12–0.34) 0.17 (0.09–0.25)
Level of medical education
 Resident 0.38 (0.29–0.47) 0.19 (0.07–0.31) 0.13 (0.04–0.20)
 Attending specialist 0.26 (0.15–0.35) 0.16 (0.04–0.28) 0.19 (0.11–0.28)
 Consultant 0.15 (0.03–0.27) 0.15 (0.01–0.29) 0.08 ((− 0.05)–0.21)
 Head of the department/professor 0.43 (0.33–0.52) 0.40 (0.31–0.48) 0.27 (0.18–0.37)
Working experience in years
 0–2 0.55 (0.39–0.69) 0.54 (0.35–0.71) 0.26 (0.09–0.42)
 3–6 0.30 (0.21–0.39) 0.17 (0.05–0.29) 0.11 (0.02–0.20)
 7–12 0.30 (0.14–0.45) 0.17 ((− 0.01)–0.32) 0.12 ((− 0.05)–0.29)
 13–20 0.11 ((− 0.03)–0.25) 0.17 ((− 0.01)–0.33) 0.15 (0.01–0.29)
 > 20 0.35 (0.25–0.44) 0.22 (0.11–0.33) 0.18 (0.09–0.27)
Working experience in polytrauma-cases per month
 0 0.50 (0.21–0.76) 0.51 (0.20–0.78) 0.25 (0.04–0.47)
 1 0.34 (0.22–0.46) 0.40 (0.28–0.51) 0.22 (0.10–0.35)
 2–3 0.27 (0.17–0.38) 0.22 (0.10–0.34) 0.22 (0.13–0.30)
 4–5 0.04 ((− 0.13)–0.20) 0.02 ((− 0.17)–0.19) − 0.04 ((− 0.22)–0.13)
 6–10 0.44 (0.34–0.53) 0.35 (0.22–0.46) 0.23 (0.12–0.33)
 > 10 0.41 (0.33–0.50) 0.04 ((− 0.09)–0.16) 0.01 ((− 0.11)–0.12)
Level of medical trauma care
 1–2 0.39 (0.29–0.47) 0.22 (0.11–0.34) 0.18 (0.08–0.28)
 3 0.22 (0.04–0.38) 0.20 (0.03–0.37) 0.16 (0.01–0.30)
 4–5 0.33 (0.23–0.43) 0.26 (0.13–0.38) 0.19 (0.10–0.28)
Region of medical education
 Europe 0.29 (0.19–0.40) 0.16 (0.03–0.28) 0.13 (0.04–0.22)
 Asia 0.36 (0.28–0.44) 0.37 (0.25–0.47) 0.28 (0.20–0.36)
 Africa 0.44 (0.34–0.54) 0.23 (0.12–0.33) 0.26 (0.16–0.36)
Region of current employment
 Europe 0.33 (0.23–0.43) 0.21 (0.08–0.33) 0.14 (0.05–0.22)
 Asia 0.25 (0.16–0.34) 0.27 (0.17–0.37) 0.15 (0.05–0.25)
 Africa 0.45 (0.35–0.55) 0.23 (0.12–0.34) 0.26 (0.16–0.36)
  1. Statistical method of Krippendorff’s alpha (α) reliability coefficient: > 0.75 (excellent agreement beyond chance), 0.40–0.75 (fair-to-good agreement beyond chance) and < 0.40 (poor agreement beyond chance)
  2. ISS: Injury Severity Score; NISS: New Injury Severity Score; MAIS: Maximum Abbreviated Injury Scale; CI: confidence interval