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

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

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
  1. 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)