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Table 3 Agreement between the gait parameters (mean, standard deviation and coefficient of variance – CV) measured by the smartphone-based kinematics (Mob) and the optoelectronic criterion system (OS). Bias and Limits of Agreement (LoA) from the Bland-Altman analysis with 95% Confident Intervals (CI). The result of the D’Agostino-Pearson omnibus test (K2) is presented for each gait parameter with respective p value

From: Validation of quantitative gait analysis systems for Parkinson’s disease for use in supervised and unsupervised environments

  

Mean ± Standard deviation

CV

Bias

LoA (lower)

LoA (upper)

D’Agostino & Pearson

  

OS

Mob

OS (%)

Mob (%)

Bias

95% CI

95% CI

LoA

95% CI

95% CI

LoA

95% CI

95% CI

K2

p value

Stride duration (s)

Left

1071 ± 0,098

1072 ± 0,100

9139

9375

0,000

−0,003

0,002

−0,047

−0,049

− 0,044

0,046

0,044

0,049

3480

0,176

Right

1095 ± 0,109

1098 ± 0,109

9935

9947

−0,002

− 0,006

0,001

− 0,063

− 0,067

−0,059

0,058

0,054

0,062

3316

0,191

Stance duration (s)

Left

0,688 ± 0,079

0,696 ± 0,085

11,457

12,205

−0,008

−0,012

−0,004

− 0,074

−0,077

− 0,070

0,058

0,054

0,061

3969

0,137

Right

0,686 ± 0,081

0,705 ± 0,085

11,878

12,045

−0,019

−0,023

− 0,015

− 0,084

−0,088

− 0,080

0,046

0,042

0,050

5530

0,063

Swing duration (s)

Left

0,387 ± 0,032

0,379 ± 0,037

8279

9747

0,008

0,004

0,012

−0,058

−0,062

− 0,054

0,074

0,070

0,077

4341

0,114

Right

0,403 ± 0,039

0,389 ± 0,044

9661

11,303

0,014

0,010

0,018

−0,055

−0,060

− 0,051

0,083

0,079

0,087

5574

0,062

Stride speed (m/s)

Left

0,802 ± 0,136

0,807 ± 0,139

16,919

17,179

−0,005

−0,010

0,000

−0,091

−0,095

− 0,086

0,080

0,076

0,085

5921

0,052

Right

0,808 ± 0,145

0,812 ± 0,148

17,951

18,244

0,014

−0,055

0,083

−0,102

− 0,108

−0,096

0,097

0,091

0,103

5246

0,073

Cadence (strides/min)

Left

56,303 ± 4882

56,287 ± 4983

8670

8852

0,016

−0,119

0,151

− 2303

− 2432

− 2162

2335

2194

2464

2681

0,262

Right

54,984 ± 5347

54,885 ± 5325

9724

9701

0,099

− 0,100

0,299

− 3105

− 3295

− 2896

3303

3094

3494

4443

0,108

Stride length (m)

Left

0,862 ± 0,142

0,868 ± 0,145

16,512

16,731

−0,006

−0,010

− 0,002

−0,075

− 0,079

−0,072

0,063

0,059

0,067

1972

0,373

Right

0,896 ± 0,121

0,906 ± 0,107

16,139

15,851

−0,008

−0,013

0,003

−0,084

−0,088

− 0,079

0,068

0,063

0,072

3317

0,190