Table 3.

Correlation coefficients among PPP, PPG, and PGA in three walking durations (1.8, 3.6, and 5.4 mph) at two walking durations (10 and 20 min)

		PPP and PPG			PPP and PGA			PPG and PGA
Duration	Speed	r	p-value		r	p-value		r	p-value
10 min	1.8 mph	0.831	< 0.000	**	0.147	0.319		0.223	0.127
	3.6 mph	0.808	< 0.000	**	-0.078	0.599		0.089	0.546
	5.4 mph	0.834	< 0.000	**	0.309	0.032	*	0.308	0.033	*
20 min	1.8 mph	0.819	< 0.000	**	0.383	0.007	**	0.591	< 0.001	**
	3.6 mph	0.865	< 0.000	**	0.136	0.356		0.193	0.189
	5.4 mph	0.846	< 0.000	**	0.213	0.146		0.332	0.021	*

PPG Peak pressure gradient, PGA Pressure gradient angle, T1 First toe, M1 First metatarsal head, M2 Second metatarsal head, and HL Heel; Data are shown as correlation coefficients

^*, a significant difference (p < 0.05)

^**, a significant difference (p < 0.01)