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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