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Table 1 Concurrent validity of gait parameters measured by inertial measurement units (relative to optical motion capture)

From: Kinematics and temporospatial parameters during gait from inertial motion capture in adults with and without HIV: a validity and reliability study

Parameter RMSE, mean (SD) MAPE, % Bias LoA RMSE, mean (SD) MAPE, % Bias LoA
SNP PLHIV
Spatial parameters
 Step length (cm) 3.22 (1.63) 1.66 − 1.05 − 5.83; 3.72 4.38 (2.01) 1.07 − 0.74 − 4.95; 3.47
 Normalized step length 0.04 (0.02) 1.66 − 0.01 − 0.07; 0.04 0.05 (0.02) 1.07 − 0.01 − 0.05; 0.04
 Stride length 4.46 (3.51) 2.51 − 3.26 − 11.45; 4.92 4.46 (2.62) 2.28 − 2.95 − 10.68; 4.78
 Normalized stride length 0.05 (0.04) 2.51 − 0.04 − 0.13; 0.05 0.05 (0.03) 2.28 − 0.03 − 0.11; 0.05
Temporal parameters
 Cadence (steps/min) 6.93 (4.41) 0.39 0.49 − 5.55; 6.54 6.15 (4.86) 0.18 0.01 − 4.75; 5.00
 Stance time (s) 0.02 (0.01) 1.22 0.01 − 0.03; 0.04 0.03 (0.02) 1.06 0.01 − 0.04; 0.05
 Step time (s) 0.03 (0.02) 0.12 < 0.00 − 0.03; 0.03 0.03 (0.02) 0.17 < 0.00 − 0.02; 0.02
 Single support time (s) 0.02 (0.01) 1.21 − 0.01 − 0.03; 0.02 0.02 (0.01) 1.43 − 0.01 − 0.02; 0.01
 Double support time (s) 0.03 (0.01) 7.40 0.01 − 0.04; 0.06 0.03 (0.03) 5.79 0.01 − 0.05; 0.07
Temporophasic parameters
 Stance percentage (%GC) 1.72 (0.39) 0.98 0.57 − 1.37; 2.51 1.97 (1.23) 1.13 0.69 − 2.00; 3.43
 Single support percentage (%GC) 2.44 (1.35) 1.37 − 0.57 − 3.53; 2.39 2.31 (1.40) 1.26 − 0.50 − 3.24; 2.24
 Double support percentage (%GC) 3.01 (1.14) 6.96 1.14 − 3.58; 5.86 2.68 (2.29) 5.69 1.18 − 4.14; 6.51
Temporospatial parameters
 Gait speed (m/s) 0.04 (0.03) 2.68 − 0.03 − 0.11; 0.04 0.04 (0.03) 2.13 − 0.03 − 0.10; 0.05
 Normalized gait speed 0.01 (0.01) 2.68 − 0.01 − 0.04; 0.01 0.01 (0.01) 2.13 − 0.01 − 0.03; 0.02
  1. MAPE mean absolute percentage error, GC gait cycle, LoA limits of agreement, PLHIV people living with HIV-1 infection, RMSE root-mean-square error, SNP HIV-seronegative participants