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Table 4 Number of trials needed to reach good performance stability and test–retest reliability (ICC > 0.75)

From: How many trials are needed in kinematic analysis of reach-to-grasp?—A study of the drinking task in persons with stroke and non-disabled controls

  Performance stability (within-session) Test–retest
  Non-disabled
(n = 44)
Stroke (n = 8) All
(n = 52)
Stroke (n = 5)
  Dominant arm Non-dominant arm More-affected arm Tested arm* More-affected arm
Temporal and end-point kinematics
Total movement time (s) 2 2 2 2 2
MT reaching (s) 3 3 5 4 3
MT forward transport (s) 2 3 2 2 2
MT drinking (s) 2 2 2 2 2
MT back transport (s) 2 2 2 2 2
MT returning (s) 5 8 8 8
NMU total 3 2 2 2
NMU phase 1&2 6 9 3 2 2
NMU phase 4&5 6 2 3 2
Peak velocity (mm/s) 2 2 3 2
Time to peak velocity (%) 3 6 6
Peak elbow angular velocity (°/s) 2 2 2 2 2
Angular and displacement kinematics (arm and trunk)
Shoulder abduction reaching (°) 2 2 2 2 2
Shoulder abduction drinking (°) 2 2 2 2 2
Shoulder flexion reaching (°) 2 2 2 2 2
Shoulder flexion drinking (°) 2 2 2 2 2
Elbow extension reaching (°) 2 2 2 2 2
Elbow flexion drinking (°) 2 2 2 2 2
Wrist angle (°) 2 2 2 2 6
Inter-joint coordination, r 4 4 2 2 2
Trunk displacement (mm) 2 2 2 2 2
  1. Values in bold indicate good performance stability and test–retest reliability; no value indicates that more than 9 trials were needed
  2. MT movement time, NMU number of movement units
  3. *Included non-dominant arm in non-disabled and more affected arm in stroke