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Table 1 Inter- and intra reliability. Unweighted Kappa values, confidence interval (CI) and overall agreement (Po) for the inter- and intra rater reliability tests and age interval 0 – 7 years.

From: The clubfoot assessment protocol (CAP); description and reliability of a structured multi-level instrument for follow-up

   Inter-rater Intra-rater
Item S n Kappa (95% CI)) Po (%) n Kappa (95% CI) Po (%)
1. Dorsiflexion 5 69 0.73 (0.60–0.86) 85 32 0.72 (0.50–0.94) 84
2. Plantarflexion 5 67 0.62 (0.45–0.79) 79 32 0.66 (0.41–0.91) 66
3. Subtalar 5 67 0.65 (0.49–0.79) 79 32 0.83 (0.66–1.00) 91
4. Derotation 5 69 0.62 (0.45–0.79) 84 32 0.93 (0.76–1.10) 97
5. Adduktion 5 69 0.71 (0.54–0.88) 85 32 0.94 (0.83–1.05) 97
6. Tightness 4 66 0.68 (0.53–0.83) 80 32 0.61 (0.35–0.87) 78
7. Flx.dig.long 3 56 -0.03 (-0.09–0.03) ! 87 32 0.72 (0.36–1.08) 94
8. Flx.dig.hall. 3 56 0.57 (0.20–0.94) ! 93 32 0.54 (0.27–0.81) 81
9. M. Peroneus 3 69 0.60 (0.44–0.76) 75 26 0.63 (0.34–9.92) 94
10. M. ext.dig.lgn 3 68 0.36 (0.16–0.56) 75 28 1.00 100
11. M. sol/gastr. 3 63 0.35 (0.05–0.60) 84 24 1.00 100
12. Tib.rotation 3 69 0.70 (0.50–0.90) 90 31 0.84 (0.63–1.00) 94
13. Calc.pos. 3 65 0.63 (0.43–0.83) 85 32 0.80 (0.53–1.00) 94
14. Forefootpos. 3 62 0.63 (0.44–0.82) 82 32 0.82 (0.63–1.00) 91
15. Foot arch 3 64 0.5 (0.30–0.86) ! 92 31 1.00 100
16. Walking 4 46 0.68 (0.50–0.86) 80 27 0.81 (0.63–0.99) 89
17. Toe walking 4 34 0.49 (0.21–0.77) 73 15 0.61 (0.27–0.95) 80
18. Heelwalking 4 34 0.47 (0.23–0.71) 65 15 0.79 (0.52–1.00) 87
19. Squatting 4 19 0.56 (0.18–0.94) 79 19 0.80 (0.54–1.00) 89
20. Running 4 40 0.38 (0.14–0.62) 62 27 0.78 (0.59–0.97) 85
21. One legstand 4 22 0.70 (0.45–0.95) 77 9 0.68 (0.28–1.00) 77
22. Hop 1 leg 4 22 0.94 (0.82–1.06) 95 9 0.70 (0.33–1.07) 77
  1. S = amount of scales, n = number of feet assessed
  2. ! = limited variation of cell frequency