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. 2016 May 23;6:25730. doi: 10.1038/srep25730

Figure 5. Relationship between apnea-hypopnea index (AHI) and measured snoring sounds frequencies (assessed by Pearson Correlation Coefficient).

Figure 5

(a) Decreases in the measured F2 (calculated over entire sleep duration) were significantly correlated with the increases of AHI; (b) Decreases in the measured spectral centroid of snoring sounds (calculated over the entire sleep duration) within 1200–1800 Hz frequency range were significantly correlated with the increases of AHI; (c) Decreases in the measured spectral centroid of snoring sounds (calculated over the entire sleep duration) within 450–600 Hz frequency range were significantly correlated with the increases of AHI.