Development of a Plantar Load Estimation Algorithm for Evaluation of Forefoot Load of Diabetic Patients during Daily Walks Using a Foot Motion Sensor

Table 1

Correlation between FL from force sensors on the forefoot and estimated FL from all the motion sensors (left part of the tables)/foot motion sensors (right part of the tables).

(a) Walking on a level corridor

All the motion data of the lower body segments			Only each foot motion data
ID	Mean ± SD of the Pearson correlation coefficient		ID	Mean ± SD of the Pearson correlation coefficient
	Left	Right		Left	Right
3	0.68 ± 0.08	0.58 ± 0.10	3	0.72 ± 0.06	0.71 ± 0.05
5	0.07 ± 0.03	0.69 ± 0.10	5	0.69 ± 0.04	0.71 ± 0.04
6	0.62 ± 0.09	0.71 ± 0.05	6	0.67 ± 0.04	0.55 ± 0.06
8	0.68 ± 0.08	0.83 ± 0.04	8	0.61 ± 0.04	0.58 ± 0.09
10	0.07 ± 0.17	0.47 ± 0.14	10	0.57 ± 0.08	0.48 ± 0.10

(b) Walking up stairs

All the motion data of the lower body segments			Only each foot motion data
ID	Mean ± SD of the Pearson correlation coefficient		ID	Mean ± SD of the Pearson correlation coefficient
	Left	Right		Left	Right
2	0.72 ± 0.06	0.66 ± 0.18	2	0.10 ± 0.23	−0.21 ± 0.04
4	0.65 ± 0.11	0.43 ± 0.16	4	0.39 ± 0.30	0.10 ± 0.56
6	0.67 ± 0.05	0.74 ± 0.04	6	0.67 ± 0.05	0.74 ± 0.04
8	0.74 ± 0.07	0.44 ± 0.07	8	0.68 ± 0.09	0.64 ± 0.10
10	0.38 ± 0.15	0.42 ± 0.14	10	0.05 ± 0.19	0.44 ± 0.16

(c) Walking up a slope

All the motion data of the lower body segments			Only each foot motion data
ID	Mean ± SD of the Pearson correlation coefficient		ID	Mean ± SD of the Pearson correlation coefficient
	Left	Right		Left	Right
3	0.42 ± 0.28	0.27 ± 0.39	3	0.72 ± 0.03	0.57 ± 0.07
4	0.07 ± 0.15	0.55 ± 0.13	4	0.43 ± 0.13	0.54 ± 0.19
5	0 ± 0.13	0.23 ± 0.09	5	0.57 ± 0.09	0.57 ± 0.12
8	0.54 ± 0.35	0.60 ± 0.34	8	0.42 ± 0.21	0.23 ± 0.36
10	0.30 ± 0.19	0.11 ± 0.31	10	0.29 ± 0.25	0.26 ± 0.20

(d) Walking down a slope

All the motion data of the lower body segments			Only each foot motion data
ID	Mean ± SD of the Pearson correlation coefficient		ID	Mean ± SD of the Pearson correlation coefficient
	Left	Right		Left	Right
5	0.48 ± 0.11	0.67 ± 0.07	5	0.72 ± 0.03	0.75 ± 0.09
8	0.76 ± 0.08	0.74 ± 0.08	8	0.38 ± 0.25	0.32 ± 0.23
10	−0.17 ± 0.59	−0.07 ± 0.46	10	0.17 ± 0.35	0 ± 0.30