Table 2.

Test-retest reliability scores of the smartphone-based 2-Minute Walking Test for persons with multiple sclerosis and participants in the healthy control–matched group.

Test-retest	ICCa(A,1; 95% CI) of persons with MSb	ICC(A,1; 95% CI) of HCc participants	Cronbach α of persons with MS	Cronbach α of HC participants	Cohen d of persons with MS	Cohen d of HC participants	SEM of persons with MS (m)	SEM of HC participants (m)	SDCd of persons with MS (m)	SDC of HC participants (m)
1	0.462 (0.086 to 0.727)	0.554 (0.171 to 0.791)	.640	.708	0.301	0.150	24.0	30.6	66.4	84.7
2	0.509 (0.142 to 0.759)	0.589 (0.206 to 0.818)	.694	.742	0.369	0.219	24.0	28.6	66.6	79.3
3	0.624 (0.280 to 0.827)	0.723 (0.391 to 0.890)	.768	.863	0.185	0.145	23.2	17.6	64.2	48.8
4	0.657 (0.322 to 0.845)	0.439 (−0.057 to 0.756)	.787	.596	0.098	0.046	23.3	24.0	64.6	66.5
5	0.793 (0.547 to 0.913)	0.545 (−0.008 to 0.837)	.880	.690	0.035	0.066	15.9	23.0	44.2	63.7
6	0.873 (0.698 to 0.950)	0.659 (0.141 to 0.895)	.932	.788	0.114	0.198	12.3	23.2	34.1	64.4
7	0.823 (0.584 to 0.930)	0.633 (−0.031 to 0.905)	.912	.757	0.242	0.120	15.5	21.3	42.9	59.1
8	0.504 (0.059 to 0.781)	0.707 (−0.447 to 0.966)	.663	.794	0.154	0.010	25.5	12.8	70.6	35.4
9	0.595 (0.148 to 0.846)	0.553 (−0.773 to 0.986)	.761	.699	0.360	0.615	25.1	19.6	69.9	54.4
Mean	0.649 (0.318 to 0.842)	0.600 (−0.045 to 0.871)	.782	.734	0.206	0.174	21.0	22.3	58.1	61.8

^aICC: intraclass correlation coefficient.

^bMS: multiple sclerosis.

^cHC: healthy control.

^dSDC: smallest detectable change.