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Table 3 Internal consistency (CA) and test-retest reliability (ICC3, 1) of the FFI-Th

From: Thai version of the foot function index: a cross-cultural adaptation with reliability and validity evaluation

Item CA ICC3, 1 95% CI p-value
Total 0.974 0.942 0.897–0.967 < 0.001
Pain 0.946 0.904 0.830–0.946 < 0.001
1. Worst foot pain   0.891 0.808–0.939 < 0.001
2. Morning foot pain   0.899 0.821–0.943 < 0.001
3. Pain walking barefoot   0.896 0.815–0.941 < 0.001
4. Pain standing barefoot   0.829 0.696–0.903 < 0.001
5. Pain walking with shoes   0.796 0.638–0.885 < 0.001
6. Pain standing with shoes   0.692 0.451–0.827 < 0.001
7. Pain walking with orthotics   0.918 0.807–0.965 < 0.001
8. Pain standing with orthotics   0.902 0.765–0.959 < 0.001
9. Foot pain at end of day   0.900 0.819–0.945 < 0.001
Disability 0.975 0.938 0.890–0.965 < 0.001
10. Walking in house   0.921 0.860–0.955 < 0.001
11. Walking outside   0.957 0.923–0.976 < 0.001
12. Walking four blocks   0.830 0.693–0.906 < 0.001
13. Climbing stairs   0.861 0.751–0.922 < 0.001
14. Descending stairs   0.912 0.844–0.951 < 0.001
15. Standing on tiptoe   0.876 0.773–0.932 < 0.001
16. Getting up from chair   0.904 0.830–0.946 < 0.001
17. Climbing curbs   0.908 0.833–0.949 < 0.001
18. Running or walking fast   0.882 0.786–0.935 < 0.001
Activity limitation 0.714 0.866 0.763–0.925 < 0.001
19. Using device indoors   0.890 0.801–0.939 < 0.001
20. Using device outdoors   0.795 0.621–0.889 < 0.001
21. Staying inside all day   0.838 0.705–0.911 < 0.001
22. Staying in bed all day   0.691 0.351–0.853 0.001
23. Limiting activities   0.534 0.008–0.781 0.024
  1. The data treated by the cold deck technique
  2. CA Cronbach’s alpha, ICC3, 1 Intraclass Correlation Coefficient of the two-way mixed model (Consistency), CI Confidence interval