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Table 2 Results of the validity analysis. The table presents the resultant linear acceleration for each participant with PD when measured with the shoe-type IMU system versus the motion capture system

From: Validity of shoe-type inertial measurement units for Parkinson’s disease patients during treadmill walking

 

Left shoe

Right shoe

 

ICC (2,1)

95% CI of ICC

(min, max)

RMSE (m/s2)

Percent RMSE (%)

ICC (2,1)

95% CI of ICC (min, max)

RMSE (m/s2)

Percent RMSE (%)

Participant 1

0.982*

0.981, 0.983

1.630

6.05

0.978*

0.977, 0.979

1.791

7.59

Participant 2

0.983*

0.982, 0.984

2.896

6.67

0.979*

0.978, 0.980

2.997

7.07

Participant 3

0.970*

0.968, 0.971

1.366

6.13

0.957*

0.954, 0.959

2.050

7.33

Participant 4

0.963*

0.961, 0.964

1.602

7.25

0.955*

0.953, 0.958

1.785

7.18

Participant 5

0.961*

0.959, 0.963

1.850

6.83

0.980*

0.978, 0.981

1.842

5.13

Participant 6

0.985*

0.985, 0.986

1.368

4.78

0.982*

0.981, 0.983

1.389

4.78

Participant 7

0.962*

0.960, 0.963

1.221

6.71

0.957*

0.954, 0.959

1.524

8.97

Participant 8

0.980*

0.979, 0.981

1.689

5.58

0.970*

0.968, 0.971

1.909

6.46

Participant 9

0.982*

0.981, 0.983

1.649

6.32

0.968*

0.967, 0.970

1.884

7.21

Participant 10

0.956*

0.954, 0.958

2.642

10.11

0.966*

0.964, 0.967

2.117

7.91

Participant 11

0.971*

0.969, 0.972

1.867

6.83

0.955*

0.953, 0.957

2.055

7.59

Participant 12

0.961*

0.959, 0.963

2.618

10.44

0.951*

0.949, 0.954

2.483

8.16

Participant 13

0.967*

0.965, 0.968

2.175

6.12

0.964*

0.963, 0.966

1.546

4.67

Participant 14

0.973*

0.971, 0.974

1.156

4.62

0.976*

0.975, 0.977

1.207

5.50

Participant 15

0.977*

0.976, 0.978

2.564

7.45

0.958*

0.956, 0.960

1.855

6.32

Participant 16

0.964*

0.962, 0.966

2.362

8.21

0.944*

0.941, 0.947

2.132

9.65

Participant 17

0.964*

0.962, 0.966

3.254

6.62

0.970*

0.969, 0.972

3.582

7.49

M ± SD

0.971 ± 0.009

 

1.994 ± 0.629

6.87 ± 1.56

0.965 ± 0.011

 

2.009 ± 0.579

7.00 ± 1.39

  1. *: results of the correlation analysis, p < 0.001; CI confidence interval, ICC intraclass correlation coefficient; RMSE root mean square error