Table 5. Spearman correlation of acoustic parameters with drug-induced sleep endoscopic findings.

Site	Multi-Level	Velopharynx	Oropharynx		Tongue Base	Epiglottis
	≥2 Sites		Tonsils	Lateral Wall
Degree of Obstruction	Complete	Complete	Partial-to-Complete	Partial-to-Complete	Complete	Partial-to-Complete
N (%)	15 (42)	18 (50)	18 (50)	13 (37)	21 (58)	14 (39)
Peak sound frequency
Total	0.37A	0.16	−0.13	0.36A	0.21	0.31
B1	0.44A	0.33A	−0.10	0.28	0.21	0.39A
B2	0.24	0.39A	0.13	0.16	0.28	0.16
B3	0.34A	0.29	−0.13	0.30	0.40A	0.27
Snoring index
Total	0.26	0.09	−0.05	0.11	0.11	0.19
B1	0.13	−0.01	−0.08	0.08	0.02	0.07
B2	0.40A	0.23	0.06	0.18	0.26	0.33A
B3	0.37A	0.35A	0.10	0.16	0.33A	0.29
Maximal sound intensity
Total	0.38A	0.00	−0.17	0.24	0.09	0.30
B1	0.53A	0.14	−0.27	0.40A	0.18	0.44A
B2	0.55A	0.11	−0.23	0.38A	0.31	0.46A
B3	0.33	0.05	−0.18	0.27	0.11	0.25
Mean sound intensity
Total	0.39A	0.11	−0.21	0.38A	0.16	0.31
B1	0.39A	0.08	-−0.23	0.30	0.20	0.32
B2	0.36A	0.05	−0.44A	0.45A	0.21	0.28
B3	0.29	0.05	−0.22	0.35A	0.14	0.24
Mean sound frequency
Total	0.28	0.25	0.09	0.15	0.08	0.24
B1	0.17	−0.03	0.11	0.06	−0.07	0.19
B2	−0.13	0.10	0.05	−0.17	0.18	−0.10
B3	0.26	0.09	−0.36A	0.40A	0.17	0.27

NOTE: Data are the unadjusted Spearman correlation coefficients.

^AP-values are less than 0.05.