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Table 2 Reliability of 35 performance measures extracted from the five tablet tasks

From: A novel tablet-based application for assessment of manual dexterity and its components: a reliability and validity study in healthy subjects

Variables

N

Rater1 (Mean ± SD)

Rater2 (Mean ± SD)

ICC (95CI)

Corr. (r) or (rs)

SEM (95%CI)

MDC (95%CI)

p-value

Finger recognition

 1. RT mirror cond. (ms)

32

635 ± 85.7

606.9 ± 88.16

0.72

0.71***

46.79

129.7

0.20

 2. RT inverted cond. (ms)

 

857.4 ± 160.6

794 ± 181.3

0.77

0.77***

83.86

232.44

0.14

 3. RT rotated cond. (ms)

 

771.9 ± 124.2

716.7 ± 162.6

0.71

0.59***

72.93

202.15

0.01†

 4. Average RT (ms)

 

754.8 ± 110.7

705.9 ± 132.9

0.82

0.82***

53.6

148.55

0.12

 5. RT cond. inverted-mirror (ms)

 

222.4 ± 127

187.2 ± 124

0.64

0.56***

76.85

213.01

0.08

  6. RT cond. rotated-mirror (ms)

 

136.9 ± 86.5

109.8 ± 129.5

0.62

0.63***

68.86

190.6

0.10

 7. SD of Average RT (ms)

 

200 ± 58.1

179.4 ± 52.9

0.58

0.50**

33.81

93.71

0.02†

 8. Average Correct Trial (N)

 

0.97 ± 0.03

0.98 ± 0.03

0.46

0.40*

0.02

0.57

0.01†

Rhythm tapping

 9. ITI 1 Hz cued (ms)

27

924.8 ± 40.3

944.7 ± 25.7

0.31

0.22

28.30

78.44

0.01

 10. ITI 2 Hz cued (ms)

 

476.2 ± 25.5

484.5 ± 21.4

0.66

0.66***

13.9

38.7

0.01

 11. ITI 3 Hz cued (ms)

 

287.1 ± 19.7

311.6 ± 23.1

0.72

0.55**

11.59

32.13

 < 0.0001

 12. ITI 1 Hz no_cue (ms)

 

969.2 ± 81.3

975.9 ± 69.3

0.55

0.54**

51.47

142.71

0.63

 13. ITI 2 Hz no_cue (ms)

 

505.1 ± 28.3

504.2 ± 29.4

0.45

0.44*

21.69

60.11

0.88

 14. ITI 3 Hz no_cue (ms)

 

330.9 ± 26.8

324.5 ± 24.3

0.76

0.75***

12.95

35.89

0.08

 15. SD ITI 3 Hz no_cue (ms)

 

4.31 ± 1.94

3.35 ± 1.31

− 0.02

− 0.02

1.67

4.63

0.045

Multi-finger tapping

 16. RT single-finger (ms)

32

367.5 ± 33.8

361.9 ± 26.6

0.68

0.68***

17.64

48.90

0.21

 17. RT two-finger-combin. (ms)

31

410.9 ± 54.3

399.5 ± 37.9

0.60

0.64***

28.90

80.11

0.18†

 18. RT (two-single) (ms)

 

447.8 ± 33.8

384.5 ± 24.7

0.44

0.45*

22.42

62.14

0.28

 19. Unwanted movements single-finger (N/trial)

 

0.06 ± 0.08

0.06 ± 0.07

0.19

0.18

0.07

0.19

0.93

 20. Unwanted movements two-finger combination (N/trial)

 

0.54 ± 0.19

0.62 ± 0.22

0.09

− 0.09

0.2

0.55

0.17

 21. Correct trials single-finger (N/trial)

 

0.98 ± 0.04

0.94 ± 0.18

− 0.05

− 0.06

0.13

0.36

0.91

 22. Correct trials two-finger combination (N/trial)

 

0.90 ± 0.12

0.94 ± 0.07

− 0.09

− 0.11

0.1

0.28

0.09

Sequence tapping

 23. STT.memory.seq1 (N correct trials)

34

4.38 ± 1.2

4.6 ± 0.9

0.72

0.48**

0.57

1.61

0.31

 24. STT.acquisition-memory.seq1 (N)

 

0.5 ± 1.2

0.36 ± 0.84

0.69

0.29

0.59

1.62

0.65

 25. STT.memory.seq2 (N)

29

4.7 ± 0.78

4.64 ± 0.84

0.76

0.65***

0.41

1.14

0.59

 26. STT.acquisition-memory.seq2 (N)

 

0.24 ± 0.77

0.27 ± 0.74

0.66

0.64***

0.45

1.26

0.38

 27. Mean STT. memory. seq1 + 2 (N)

 

4.47 ± 0.95

4.54 ± 0.85

0.84

0.84

0.45

1.26

0.47

Line tracking

 28. Duration single-task (s)

34

36.6 ± 14

32.4 ± 14.8

0.78

0.72***

6.77

18.77

0.01†

 29. Duration dual-task (s)

 

33.7 ± 10.1

30.9 ± 9.2

0.76

0.75***

4.85

13.44

0.02

 30. Average Duration single + dual (s)

 

34.7

31.4 ± 10.7

0.84

0.84***

0.76

2.11

0.002†

 31. Duration (dual-task-single-task) (s)

 

− 2.9 ± 8.4

− 1.5 ± 8.2

0.34

0.28

0.34

0.94

0.51

 32. Average Error (N pixels)

 

81.6 ± 23.6

72.3 ± 17.9

0.60

0.57***

12.51

34.68

0.002†

 33. Error/duration single-task (N/s)

 

2.6 ± 1.2

2.4 ± 1

0.69

0.62***

0.69

1.91

0.32†

 34. Error/duration dual-task (N/s)

 

2.4 ± 1.1

2.4 ± 1.1

0.69

0.62***

0.59

1.63

0.44†

 35. Average Error/duration (N/s)

 

2.5 ± 1.1

2.4 ± 1.1

0.76

0.64***

0.54

1.50

0.87†

  1. Variables in bold: selected for inter-task correlations (Additional file 1: Table S1). Terms in italics denote various task conditions. N = sample size, SD: standard deviation, ICC: Intraclass correlation, RT: reaction time (ms), ITI: intertap interval, cued: with auditory cues, no_cue: without auditory cues. STT: number of successful tap trials. Corr: correlation coefficient between rater1 and rater2 values, r: Pearson’s correlation, rs: Spearman’s correlation. Note: asterisks indicate level of significance: *p ≤ 0.05, **p ≤ 0.01, ***p ≤ 0.001. p-values followed by † are based on non-parametric Wilcoxon paired test, otherwise paired t-test. ICCs based on not log-transformed data showed only small deviations from the corresponding log-transformed data, suggesting good robustness (N = 10 variables, mean absolute difference: r = 0.04, range = [0.0, 0.06])
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Journal of NeuroEngineering and Rehabilitation

ISSN: 1743-0003

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