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Table 2 Mean values and standard deviation for gait parameters under single task condition (Mean ± SD), and intra-class correlation (ICC), inter-trial reliability (SEM; SEM%) and sensitivity to change (MDC95, MDC95%) for these gait parameters across measurement systems

From: An interrater reliability study of gait analysis systems with the dual task paradigm in healthy young and older adults

Parameter GaitUp Mean (SD) Opto-Gait Mean (SD) GAIT-rite Mean (SD) Zebris Mean (SD) Mobility Lab Mean (SD) ICCc (95% CI) ICCa (95% CI) SEM (SEM%) MDC95 (MDC95%) ANOVA
velocity (m/s) YA 1.47 (0.19) 1.45 (0.19) 1.48 (0.19) 1.44 (0.24) 1.36 (0.19) 0.99 (0.98–0.99) 0.98 (0.93–0.99) 0.02 (1.26) 0.05 (3.49) F(4,9) = 21.9***
velocity (m/s) OA 1.23 (0.19) 1.23 (0.20) 1.24 (0.19) 1.19 (0.22) 1.10 (0.19) 0.87 (0.69–0.96) 0.86 (0.68–0.95) 0.08 (6.43) 0.21 (17.8) F(4,11) = 1.39ns
cadence (steps/s) YA 111.8 (9.68) 111.5 (9.97) 112.1 (9.35) 117.1 (19.66) 111.6 (9.73) 0.96 (0.91–0.99) 0.96 (0.89–0.98) 2.24 (1.99) 6.22 (5.51) F(4,9) = 2.29T
cadence (steps/s) OA 106.9 (9.21) 106.6 (9.86) 107.5 (8.75) 106.3 (12.18) 105.6 (9.42) 0.99 (0.98–0.99) 0.99 (0.98–0.99) 0.82 (0.77) 2.28 (2.14) F(4,11) = 1.69ns
stride length (m) YA 1.56 (0.09) 1.56 (0.09) 1.58 (0.10) 1.49 (0.04) 1.44 (0.13) 0.95 (0.88–0.97) 0.88 (0.62–0.97) 0.02 (1.27) 0.05 (3.51) F(4,9) = 18.1***
stride length (m) OA 1.37 (0.16) 1.37 (0.16) 1.38 (0.16) 1.35 (0.15) 1.25 (0.14) 0.99 (0.98–0.99) 0.96 (0.84–0.99) 0.02 (1.12) 0.04 (3.11) F(4,11) = 34.4***
single limb support (%GCT) YA 82.9 (3.01) 75.1 (2.45) 75.9 (2.59) 86.7 (2.07) 82.1 (1.73) 0.71 (0.27–0.92) 0.26 (−0.01–0.64 0.89 (1.09) 2.45 (3.05) F(4,9) = 61.9***
single limb support (%GCT) OA 79.9 (2.33) 73.3 (2.57) 73.5 (2.19) 85.4 (1.32) 79.1 (2.93) 0.81 (0.57–0.94) 0.31 (0.02–0.66) 0.76 (0.98) 2.11 (2.69) F(4,11) = 105.6***
double limb support (%GCT) YA 17.0 (3.01) 24.9 (2.45) 24.0 (2.59) 13.3 (2.07) 17.7 (1.88) 0.73 (0.33–0.92) 0.27 (−0.01–0.66) 0.88 (4.52) 2.43 (12.5) F(4,9) = 63.4***
double limb support (%GCT) OA 20.1 (2.33) 26.7 (2.57) 26.5 (2.19) 14.6 (1.32) 20.9 (2.93) 0.81 (0.56–0.94) 0.31 (0.02–0.66) 0.76 (3.51) 2.12 (9.72) F(4,11) = 104.9***
stance (%GCT) YA 58.4 (1.39) 62.5 (1.27) 61.9 (1.29) 66.7 (4.19) 58.8 (1.06) −7.49 (−20.2–1.41)§ −0.45 (−0.54–0.16)§ 1.08 (1.75) 2.99 (4.85) F(4,9) = 19.5***
stance (%GCT) OA 60.2 (1.23) 63.5 (1.36) 63.2 (1.09) 65.1 (2.08) 60.4 (1.35) 0.82 (0.59–0.94) 0.46 (0.07–0.79) 0.47 (0.76) 1.31 (2.09) F(4,11) = 49.3***
  1. YA Young adults, OA Older adults, GTC Gait cycle time, ICC Intra-class-correlation, A absolute agreement, C consistency, 95% CI 95% confidence interval; §The Tukey Additivity Test shows a significant interaction effect between the systems and the persons being assessed, which contradicts the requirements for the ICC analysis. An interpretation is not possible due to a possible under- or overestimation and since reliability measures are by definition limited to a value range from 0 to 1, negative ICCs indicate a reliability of 0 [46]; SEM Standard error of measurement, mdc minimal detectable change. In order to be able to compare both measures, they were additionally expressed as percentages (SEM% and MDC95%). ANOVA to calculate the differences between the measurement systems: T Tendency, ns Not significant, *p < .05, **p < .01, ***p < .001
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European Review of Aging and Physical Activity

ISSN: 1861-6909

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