Table 6

Inter-observer agreement coefficient (Gwet’s AC2) for researchers, clinicians, students and all 24 observers combined (AC2 values adjusted with critical values*)

Locomotion scoreAC2 for all observers combinedAC2 for researchersAC2 for cliniciansAC2 for students
0 (95% CI)0.81 (0.86 to 0.94)Almost perfect0.73 (0.84 to 0.97)Substantial0.73 (0.87 to 0.95)Substantial0.71 (0.84 to 0.94)Substantial
1 (95% CI)0.72 (0.75 to 0.88)Substantial0.61 (0.67 to 0.91)Substantial0.66 (0.79 to 0.90)Substantial0.62 (0.66 to 0.95)Substantial
2 (95% CI)0.76 (0.78 to 0.93)Substantial0.73 (0.86 to 0.97)Substantial0.71 (0.81 to 0.98)Substantial0.53 (0.56 to 0.86)Moderate
3 (95% CI)0.88 (0.99 to 1)Almost perfect0.80 (0.94 to 1)Substantial0.78 (0.92 to 0.99)Substantial0.78 (0.91 to 1)Substantial
  • Classification of adjusted values based on Landis and Koch.14 NB. 95% CI refers to the unadjusted AC2 values, therefore adjusted AC2 point estimates may not fall within the unadjusted 95% CI.

  • *Critical value for all 24 observers=0.09, critical value for 8 observers=0.18.10