Oxygen Cost of Walking in Persons with Multiple Sclerosis: Disability Matters, but Why?

Table 2

Pearson product-moment correlations (𝑟) among oxygen cost of walking, Patient-Determined Disease Steps scores, and symptomatic and gait variables in 82 persons with MS.

Variable	1	2	3	4	5	6	7	8	9
(1) O2 cost of walking	—
(2) PDDS	0.546**	—
(3) FSS	0.223*	0.539**	—
(4) SF-MPQ	0.059	0.380**	0.515**	—
(5) HADS-anxiety	−0.051	0.069	0.320**	0.279*	—
(6) HADS-depression	0.078	0.291**	0.475**	0.401**	0.413**	—
(7) Gait velocity	−0.620**	−0.791**	−0.457**	−0.358**	−0.082	−0.236*	—
(8) Cadence	−0.730**	−0.684**	−0.318**	−0.234*	−0.017	−0.141	0.845**	—
(9) Step length	−0.528**	−0.719**	−0.441**	−0.363**	−0.113	−0.229*	0.933**	0.626**	—

Note. **significance at 𝑝<0.01; *significance at 𝑝<0.05; PDDS: Patient-Determined Disease Steps; FSS: Fatigue Severity Scale; SF-MPQ: Short-Form McGill Pain Questionnaire; HADS: Hospital Anxiety and Depression Scale.