Table 1.

Descriptive statistics of Chair Stand Test and Stair Climb Test with comparisons between app-derived data and human-observed data.

Statistic	Chair Stand Test, stands	Stair Climb Test, seconds
Average human count	19.3	10.9
Average MATLAB count	18.6	9.2
Average absolute difference	0.7	1.7
Pearson’s correlation coefficient	.890	.865
Average test-retest	1.38	1.77
SDtest-retesta	1.27	1.32
Intraclass correlation coefficient	.968	.902
Standard error of measurement	0.227	0.433
Standard error of measurement, %	1.12	3.94
Repeatability coefficient	0.629	1.20

^aSDtest-retest: standard deviation of test-retest means.