Table 3.
Linearly Weighted Kappa Coefficients for RPD Scales for Each of 24 Exercises Within Visits 1 and 2 and Between Visits 1 and 2a
| Kappa Coefficient (95% CI) | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Numerical Scale | Qualitative Scale | |||||||||
| Within Visit | Between Visits | Within Visit | Between Visits | |||||||
| Exercise No. | Surface | Vision | Base of Support | Head Movement | Visit 1, Sets 1 and 2 | Visit 2, Sets 1 and 2 | 1 and 2, Set 1 | Visit 1, Sets 1 and 2 | Visit 2, Sets 1 and 2 | 1 and 2, Set 1 |
| 1 | Firm | EO | FA | Still | 0.60 (0.43 to 0.78) | 0.58 (0.42 to 0.74) | 0.43 (0.24 to 0.63) | −0.03 (−0.07 to 0.00) | 0.38 (−0.18 to 0.93) | −0.04 (−0.08 to 0.00) |
| 2 | Firm | EO | FA | Yaw | 0.57 (0.45 to 0.69) | 0.56 (0.40 to 0.73) | 0.40 (0.26 to 0.55) | 0.64 (0.27 to 1.02) | 0.46 (0.14 to 0.78) | 0.28 (−0.08 to 0.64) |
| 3 | Firm | EO | FA | Pitch | 0.50 (0.32 to 0.69) | 0.56 (0.41 to 0.71) | 0.46 (0.29 to 0.63) | 0.21 (−0.07 to 0.50) | 0.52 (0.18 to 0.85) | 0.14 (−0.14 to 0.43) |
| 4 | Firm | EO | ST | Still | 0.43 (0.28 to 0.59) | 0.55 (0.41 to 0.68) | 0.47 (0.31 to 0.62) | 0.43 (0.21 to 0.65) | 0.47 (0.30 to 0.63) | 0.51 (0.36 to 0.66) |
| 5 | Firm | EO | ST | Yaw | 0.48 (0.33 to 0.63) | 0.62 (0.52 to 0.73) | 0.41 (0.28 to 0.55) | 0.65 (0.50 to 0.79) | 0.55 (0.40 to 0.69) | 0.44 (0.29 to 0.58) |
| 6 | Firm | EO | ST | Pitch | 0.52 (0.38 to 0.67) | 0.54 (0.40 to 0.67) | 0.48 (0.35 to 0.61) | 0.55 (0.38 to 0.73) | 0.47 (0.32 to 0.63) | 0.61 (0.45 to 0.76) |
| 7 | Firm | EC | FA | Still | 0.56 (0.40 to 0.71) | 0.68 (0.55 to 0.81) | 0.54 (0.36 to 0.72) | 0.42 (0.08 to 0.76) | 0.47 (0.26 to 0.68) | 0.54 (0.24 to 0.85) |
| 8 | Firm | EC | FA | Yaw | 0.48 (0.34 to 0.62) | 0.60 (0.46 to 0.75) | 0.42 (0.28 to 0.57) | 0.33 (0.02 to 0.64) | 0.74 (0.52 to 0.97) | 0.65 (0.42 to 0.88) |
| 9 | Firm | EC | FA | Pitch | 0.54 (0.39 to 0.69) | 0.58 (0.46 to 0.70) | 0.37 (0.24 to 0.50) | 0.31 (−0.05 to 0.67) | 0.48 (0.27 to 0.69) | 0.40 (0.18 to 0.62) |
| 10 | Firm | EC | ST | Still | 0.34 (0.19 to 0.49) | 0.56 (0.44 to 0.68) | 0.40 (0.26 to 0.54) | 0.35 (0.16 to 0.54) | 0.44 (0.29 to 0.59) | 0.36 (0.18 to 0.53) |
| 11 | Firm | EC | ST | Yaw | 0.45 (0.31 to 0.59) | 0.43 (0.29 to 0.57) | 0.49 (0.37 to 0.62) | 0.38 (0.21 to 0.55) | 0.32 (0.15 to 0.48) | 0.49 (0.33 to 0.64) |
| 12 | Firm | EC | ST | Pitch | 0.51 (0.39 to 0.63) | 0.56 (0.42 to 0.69) | 0.39 (0.24 to 0.54) | 0.42 (0.24 to 0.59) | 0.55 (0.39 to 0.71) | 0.38 (0.20 to 0.55) |
| 13 | Foam | EO | FA | Still | 0.43 (0.27 to 0.58) | 0.53 (0.41 to 0.64) | 0.35 (0.20 to 0.51) | 0.49 (0.26 to 0.71) | 0.59 (0.39 to 0.78) | 0.39 (0.19 to 0.60) |
| 14 | Foam | EO | FA | Yaw | 0.45 (0.30 to 0.61) | 0.53 (0.39 to 0.68) | 0.37 (0.20 to 0.55) | 0.56 (0.41 to 0.71) | 0.50 (0.34 to 0.66) | 0.34 (0.16 to 0.52) |
| 15 | Foam | EO | FA | Pitch | 0.32 (0.17 to 0.48) | 0.48 (0.34 to 0.63) | 0.34 (0.18 to 0.50) | 0.38 (0.19 to 0.56) | 0.51 (0.35 to 0.67) | 0.42 (0.22 to 0.62) |
| 16 | Foam | EO | ST | Still | 0.39 (0.24 to 0.54) | 0.57 (0.45 to 0.69) | 0.36 (0.21 to 0.50) | 0.39 (0.20 to 0.58) | 0.49 (0.33 to 0.65) | 0.40 (0.22 to 0.58) |
| 17 | Foam | EO | ST | Yaw | 0.47 (0.33 to 0.61) | 0.56 (0.45 to 0.68) | 0.50 (0.36 to 0.64) | 0.39 (0.23 to 0.55) | 0.58 (0.44 to 0.73) | 0.46 (0.29 to 0.63) |
| 18 | Foam | EO | ST | Pitch | 0.57 (0.43 to 0.72) | 0.41 (0.26 to 0.56) | 0.35 (0.23 to 0.48) | 0.38 (0.22 to 0.53) | 0.39 (0.22 to 0.57) | 0.49 (0.35 to 0.64) |
| 19 | Foam | EC | FA | Still | 0.44 (0.30 to 0.59) | 0.55 (0.42 to 0.68) | 0.39 (0.24 to 0.55) | 0.34 (0.16 to 0.52) | 0.60 (0.43 to 0.76) | 0.26 (0.06 to 0.45) |
| 20 | Foam | EC | FA | Yaw | 0.49 (0.35 to 0.64) | 0.53 (0.43 to 0.64) | 0.36 (0.20 to 0.51) | 0.37 (0.18 to 0.56) | 0.55 (0.41 to 0.70) | 0.46 (0.29 to 0.63) |
| 21 | Foam | EC | FA | Pitch | 0.47 (0.35 to 0.59) | 0.50 (0.36 to 0.64) | 0.42 (0.28 to 0.57) | 0.45 (0.30 to 0.61) | 0.52 (0.36 to 0.68) | 0.43 (0.26 to 0.61) |
| 22 | Foam | EC | ST | Still | 0.43 (0.29 to 0.57) | 0.59 (0.47 to 0.71) | 0.45 (0.33 to 0.57) | 0.38 (0.22 to 0.55) | 0.58 (0.43 to 0.73) | 0.46 (0.32 to 0.60) |
| 23b | Foam | EC | ST | Yaw | 0.37 (0.11 to 0.62) | 0.49 (0.29 to 0.69) | 0.42 (0.24 to 0.59) | 0.42 (0.13 to 0.72) | 0.38 (0.13 to 0.63) | 0.43 (0.25 to 0.62) |
| 24b | Foam | EC | ST | Pitch | 0.39 (0.19 to 0.60) | 0.58 (0.42 to 0.74) | 0.48 (0.34 to 0.62) | 0.28 (0.01 to 0.54) | 0.36 (0.12 to 0.59) | 0.44 (0.26 to 0.62) |
aValues in bold type were considered to have at least moderate agreement on the basis of the lower bound for the estimate. EC = eyes closed; EO = eyes open; FA = feet apart; RPD = ratings of perceived difficulty; ST = semitandem.
bBecause of the number of incomplete trials in the old and very old age groups, the kappa coefficients for exercises 23 and 24 should not be generalized for all age groups.