Table 1.
Inter-rater reliability of the Feline Grimace Scale in cats with oral disease.
| Action unit | ICC (95% CI) | |
|---|---|---|
| Ears | ICCsingle | 0.68 (0.55–0.78) |
| ICCaverage | 0.89 (0.83–0.94) | |
| Eyes | ICCsingle | 0.76 (0.65–0.84) |
| ICCaverage | 0.93 (0.88–0.95) | |
| Muzzle | ICCsingle | 0.56 (0.43–0.69) |
| ICCaverage | 0.84 (0.75–0.90) | |
| Whiskers | ICCsingle | 0.64 (0.50–0.76) |
| ICCaverage | 0.88 (0.80–0.93) | |
| Head position | ICCsingle | 0.74 (0.63–0.82) |
| ICCaverage | 0.92 (0.87–0.95) | |
| FGS total score | ICCsingle | 0.84 (0.77–0.89) |
| ICCaverage | 0.95 (0.93–0.97) |
A total of 91 images were independently scored by 4 raters who were blinded to the oral conditions of cats and timing of the recording. Intraclass correlation coefficient (ICC) estimates with 95% confidence intervals (95% CI) were calculated based on single measures (ICCsingle) and average (ICCaverage) of measures, using a 2-way random effects model for absolute agreement. Interpretation of ICC was performed as following: ICC < 0.5 = poor, 0.5–0.75 = moderate, 0.75–0.9 = good, and > 0.90 = excellent reliability.