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# Table 3 Description and STAR classification of ataxic features

From: A comprehensive scheme for the objective upper body assessments of subjects with cerebellar ataxia

Test (device) | Feature | Description | STAR |
---|---|---|---|

FCT (KinectÂ©) | \(AcAlt^{X,Y(L,R)}_{FCT}\) | Acceleration alteration counts the number of times the acceleration is altered | Stability |

\(ReTi^{X,Y(L,R)}_{FCT}\) | Reaction time reflects the cross correlation of the two time sequences representing the marker and the target | Timing | |

\(KiDe^{(L,R)}_{FCT}\) | Kinematic delay measures the ratio of the index of difficulty and the movement time | Timing | |

\(DTWEr^{X,Y(L,R)}_{FCT}\) | Dynamic time warping based error measures the displacement between the performance marker and the target | Accuracy | |

FTT (IMU) | \(CITI^{(L,R)}_{FTT}\) | Coefficient of variation of inter-tap interval describes variability with respect to speed | Timing |

\(FuEn^{AcX(L,R)}_{FTT}\) | Fuzzy entropy describes the irregularity of the acceleration on X axis | Stability | |

\(FuEn^{AcZ(L,R)}_{FTT}\) | Fuzzy entropy describes the irregularity of the acceleration on Z axis | Rhythmicity | |

\(FuEn^{GyX(L,R)}_{FTT}\) | Fuzzy entropy describes the irregularity of the of gyroscopic measurement on X axis | Rhythmicity | |

FNT (IMU) | \(RF^{AAcX(L,R)}_{FNT}\) | Resonant frequency (RF) at the angular acceleration on X axis | Stability |

\(RF^{AAcZ(L,R)}_{FNT}\) | RF at the angular acceleration on Z axis | Stability | |

\(MR^{AAcX(L,R)}_{FNT}\) | Magnitude at resonance (MR) at the angular acceleration on X axis | Stability | |

\(MR^{AAcZ(L,R)}_{FNT}\) | MR at the angular acceleration on Z axis | Stability | |

\(RF^{AAcY(L,R)}_{FNT}\) | RF at the angular acceleration on Y axis | Timing | |

\(MR^{AAcY(L,R)}_{FNT}\) | MR at the angular acceleration on Y axis | Rhythmicity | |

DDKT (IMU) | \(RF^{AngX(L,R)}_{DDK}\) | RF of the angle on X axis | Stability |

\(RF^{AngZ(L,R)}_{DDK}\) | RF of the angle on Z axis | Stability | |

\(MR^{AngX(L,R)}_{DDK}\) | MR at angle on X axis | Stability | |

\(MR^{AngZ(L,R)}_{DDK}\) | MR at the angle on Z axis | Stability | |

\(RF^{AcX(L,R)}_{DDK}\) | RF at the acceleration on X axis | Stability | |

\(RF^{AcZ(L,R)}_{DDK}\) | RF at the acceleration on Z axis | Stability | |

\(MR^{AcX(L,R)}_{DDK}\) | MR at the acceleration on X axis | Stability | |

\(MR^{AcZ(L,R)}_{DDK}\) | MR at the acceleration on Z axis | Stability | |

\(RF^{AAcY(L,R)}_{DDK}\) | RF at the angular accelerations on Y axis | Timing | |

\(MR^{AAcY(L,R)}_{DDK}\) | MR at the angular accelerations on Y axis | Rhythmicity |