TABLE 3.
Joint Top Features Between the pos+ vs neg+ (Symptomatic COVID-19 Positive vs Symptomatic COVID-19 Negative) and the pos– vs neg– (Asymptomatic COVID-19 Positive vs Asymptomatic COVID-19 Negative) Differentiation Tasks Listed According to Their Mean Ranks Rounded to Integers.
| Mean rank | Feature |
|---|---|
| 17 | Flatness (Δ spectral energy 250–650 Hz) |
| 19 | Flatness (spectral energy 250–650 Hz) |
| 27 | Flatness (RMS energy) |
| 33 | Flatness (spectral flux) |
| 149 | Mean inter-peak distance (RMS energy) |
| 194 | Quartile 3 (HNR) |
| 195 | IQR 1–3 (HNR) |
| 196 | IQR 2–3 (HNR) |
| 202 | Mean inter-peak distance (loudness) |
| 291 | Mean inter-peak distance (spectral flux) |
| 410 | Skewness (Δ RASTA-filtered auditory spectral band 12) |
| 635 | Mean value of peaks (RMS energy) |
| 725 | Mean inter-peak distance (spectral harmonicity) |
| 786 | Mean value of peaks (loudness) |
HNR, harmonics-to-noise ratio; IQR, interquartile range; RASTA, relative spectral transform; RMS, root mean square; Δ= first-order derivative.