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Table 3 Intra- and inter-trail reliability for the inertial measurement unit and the force plate

From: Coherence and reliability of a wearable inertial measurement unit for measuring postural sway

  Trial 1 Trial 2 Trial 3 P-value Intra-trial reliability CV (95% CI)
Mean (SD) Mean (SD) Mean (SD) ICC (95%)
Force plate M-L
 Eyes open (mm/s) 3.88 (1.63) 4.08 (1.45) 4.15 (1.79) 0.80 0.74 (0.58–0.85) 14.7 (11.8–17.6)
 Eyes closed (mm/s) 5.85 (2.57) 5.46 (2.97) 5.07 (2.56) 0.48 0.74 (0.58–0.85) 18.4 (15.1–21.7)
Force plate A–P
 Eyes open (mm/s) 6.18 (2.14) 6.28 (2.5) 6.19 (2.54) 0.98 0.82 (0.70–0.90) 11.9 (9.6–14.1)
 Eyes closed (mm/s) 11.56 (4.86) 10.29 (4.32) 10.01 (4.09) 0.33 0.84 (0.73–0.91) 15.4 (12.3–18.6)
IMU M-L
 Eyes open (mm/s) 4.96 (2.14) 5.61 (1.99) 5.41 (2.20) 0.45 0.54 (0.34–0.72) 18.9 (14.3–23.4)
 Eyes closed (mm/s) 6.85 (3.68) 6.58 (4.15) 5.74 (2.15) 0.41 0.67 (0.50–0.81) 22.1 (17.9–26.6)
IMU A–P
 Eyes open (mm/s) 8.71 (2.51) 9.51 (3.95) 8.65 (2.42) 0.45 0.50 (0.29–0.69) 17.8 (14.3–21.2)
 Eyes closed (mm/s) 14.87 (4.99) 13.33 (4.82) 13.27 (4.40) 0.31 0.61 (0.42–0.77) 20.6 (16.9–24.3)
  1. CV coefficient of variation, CI confidence interval, ICC intra-class correlation coefficient, IMU inertial measurement unit