Table 2.
Reliability of 35 performance measures extracted from the five tablet tasks
| 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† | |
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])