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Table 4 Test-retest reliability parameters of the whole stroke sample (n = 31)

From: Concurrent validity and test-retest reliability of the Virtual Peg Insertion Test to quantify upper limb function in patients with chronic stroke

VPIT parameters

Test

Retest

Test-Retest

Kendall’s tau correlation

Kendall’s tau correlation with transformed data

ICC (95 % CI)

SEM agreement

SDD

SDD%

Mean ± SD

Mean ± SD

Mean difference ± SD

Tex [s]

119.71 ± 72.05

98.71 ± 50.77

21.01 ± 45.25

0.01

-

0.83 (0.61–0.92)

25.34

70.18

434.50

Ndp

0.54 ± 1.06

0.83 ± 1.59

−0.29 ± 1.55

0.16a

0.12b,c

0.51 (−0.01–0.76)

0.95

2.62

16.22

0.13 ± 0.19c

0.18 ± 0.23c

0.58 (0.13–0.79)c

0.14c

0.38c

2.64c

Fg go [N]

8.98 ± 5.15

8.54 ± 4.96

0.44 ± 2.43

0.10

-

0.94 (0.87–0.97)

0.14

3.46

21.42

Fg return [N]

1.66 ± 0.83

1.60 ± 0.91

0.06 ± 0.80

0.08

-

0.75 (0.47–0.88)

0.43

1.18

7.31

Nzc [1/S] go

11.09 ± 1.52

10.80 ± 1.70

0.28 ± 0.89

0.21a

0.20b,d

0.91 (0.82–0.96)

0.48

1.33

8.23

3.32 ± 0.23d

3.28 ± 0.26d

0.92 (0.82–0.96)d

0.07d

0.20d

1.37d

Nzc [1/s] return

11.36 ± 1.69

10.88 ± 1.76

0.48 ± 1.09

0.14a

0.20c

0.87 (0.71–0.94)

0.63

1.75

10.84

Etraj go [cm]

0.74 ± 0.38

0.67 ± 0.29

0.07 ± 0.32

0.03

-

0.70 (0.39–0.85)

0.19

0.53

3.28

Etraj return [cm]

0.99 ± 0.40

1.00 ± 0.56

0.01 ± 0.49

0.18a

0.20c

0.67 (0.30–0.84)

0.29

0.80

4.95

Fcmean [N]

1.32 ± 1.03

1.29 ± 0.95

0.02 ± 0.51

0.06

-

0.93 (0.86–0.97)

0.26

0.73

4.52

  1. aΤ > 0.1, Ttrans decreasedb, c = log10 transformed, d = square root transformed
  2. T ex [s] execution time in seconds, N dp number of dropped pegs during transport, F g (go/return) [N] mean grasping force of the three force sensors integrated into the handle in Newton, Nzc[1/s](go/return) number of zero-crossings of the acceleration, E traj [cm] trajectory error, F cmean mean collision force, SD Standard Deviation, ICC Intraclass Correlation Coefficient, CI Confidence Interval, SEM Standard Error of Measurement, SDD Smallest Detectable Difference