Technology-aided assessment of functionally relevant sensorimotor impairments in arm and hand of post-stroke individuals

Table 3 Test-retest reliability: intra-class correlation (ICC) coefficients and smallest real differences (SRD)

Sensor-based metric	Test-retest reliability
	Most affected side		Less affected side
	n = 18		n = 21
	ICC [CI]	SRD%	ICC [CI]	SRD%
Log jerk transport	0.89 [0.83, 0.92]	23.31	0.79 [0.69, 0.86]	30.79
Log jerk return	0.84 [0.75, 0.89]	28.55	0.89 [0.84, 0.93]	25.31
SPARC return	0.81 [0.72, 0.88]	34.70	0.87 [0.81, 0.91]	27.91
Path length ratio transport	0.58 [0.36, 0.72]	54.05	0.66 [0.50, 0.77]	52.38
Path length ratio return	0.49 [0.24, 0.66]	52.24	0.84 [0.76, 0.89]	29.09
Velocity max return	0.95 [0.92, 0.97]	16.88	0.97 [0.93, 0.98]	13.05
Jerk peg approach	0.48 [0.22, 0.65]	94.55	0.92 [0.88, 0.95]	19.75
Grip force rate num. peaks transport	0.87 [0.80, 0.91]	24.58	0.90 [0.84, 0.93]	21.70
Grip force rate SPARC transport	0.90 [0.85, 0.94]	20.49	0.89 [0.84, 0.93]	21.43
Grip force rate SPARC hole approach	0.85 [0.72, 0.91]	34.20	0.78 [0.67, 0.85]	41.39

The ICC (optimum at 1) describes the ability of a metric to discriminate between subjects across measurement sessions. The SRD% (optimum at 0%) describes a range of values for that the assessment cannot distinguish between measurement noise and an actual change in the underlying physiological construct. Bold ICC values represent acceptable test-retest reliability (i.e., above or equal 0.7). Bold SRD% indicate least strong measurement error (SRD% <30.3)

ISSN: 1743-0003