Figure 1
Distributions of Mean FTM Spiral Ratings and Log Tremor Amplitudes. Notched box and whisker plots of mean FTM spiral ratings and tablet measures are shown for the two baseline assessments. The baseline medians did not differ significantly for either measure of tremor severity. The FTM data exhibit a floor effect at 0. FTM, Fahn–Tolosa–Marín.
Figure 2
Linear Regression Equations for Log10 Tremor Amplitude vs. FTM. Regression lines (blue) and 95% confidence intervals (red broken lines) are shown for log mean tremor amplitude vs. mean FTM spiral rating for baseline 1 and 2 assessments. FTM, Fahn–Tolosa–Marín.
Table 1
Minimum Detectable Change Results for FTM and Tablet Measures of Tremor Amplitude
| FTM Mean (cm) | SDd FTM Baseline 1–2 | Tablet Geometric Mean (cm) | SDd Tablet Baseline 1–2 | MDC% | ||
|---|---|---|---|---|---|---|
| FTM | Tablet | |||||
| Baseline 1 | 0.88 | 0.41 | 0.20 | 0.164 | 90%1 | 51%3 |
| Baseline 2 | 0.94 | 0.19 | 67%2 | |||
Abbreviations: FTM, Fahn–Tolosa–Marín; MDC, Minimum Detectable Change (SDd·1.96); SDd: Standard Deviation of the Differences.
2 MDC%: percentage of baseline 1 mean FTM, computed with the Weber–Fechner equations in Figure 2.
