No. | Feature name | | Meaning |

| MDVP: Fo (Hz) | F1 | Average vocal fundamental frequency |

| MDVP: Fhi (Hz) | F2 | Maximum vocal fundamental frequency |

| MDVP: Flo (Hz) | F3 | Minimum vocal fundamental frequency |

| MDVP: Jitter (%) | F4 | Jitter as percentage |

| MDVP:Jitter(Abs) | F5 | Absolute jitter in micro second |

| MDVP: RAP | F6 | Amplitude perturbation |

| MDVP: PPQ | F7 | Period perturbation quotient |

| Jitter DDP | F8 | Average absolute differences between cycle, divided by the average period. |

| MDVP: Shimmer | F9 | Local shimmer |

| Shimmer dB | F10 | Local shimmer in decibels |

| Shimmer APQ3 | F11 | 3 points amplitude perturbation quotient |

| Shimmer APQ5 | F12 | 5 points amplitude perturbation quotient |

| MDVP: APQ | F13 | 11 points amplitude perturbation quotient |

| Shimmer DDA | F14 | Absolute differences between the amplitude of consecutive periods. |

| NHR | F15 | Noise-to-harmonic ratio |

| HNR | F16 | Harmonic-to-noise ratio |

| DFA | F17 | Signal fractal scaling exponent |

| PPE | F18 | Pitch period entropy |

| spread1 | F19 | Three nonlinear measures of fundamental frequency variation |

| spread2 | F20 |

| RPDE | F21 |

| D2 | F22 | Recurrence period density analysis |

| Status | | Health status of the subject (one) Parkinsonâ€™s, (zero) healthy |