Table 3.

Univariate and multivariate analyses of apnea-hypopnea index with parapharyngeal fat pad areas and other variables.

Variables	Univariate Spearman correlation test		Multivariable linear regression test
	coefficient	P-value	β (95% CI)	P-value
Age	−0.06	0.71	—	NI
Male gender	0.01	0.95	—	NI
Body mass index	0.37	0.02*	3.24 (0.79–5.69)	0.01*
Neck circumference	0.32	0.045*	—	NS
Tonsil grade	0.37	0.02*	—	NS
Tongue position	0.27	0.08	—	NI
MPHa	0.29	0.07	—	NI
Site of compete lateral wall collapseb
Nasopharynx	−0.12	0.44	—	NI
Oropharynx	0.14	0.39	—	NI
Subglosso-supraglottis	0.334	0.03*	—	NI
Parapharyngeal fat pad area
Nasopharyngeal level	0.35	0.02*	—	NS
Oropharyngeal level	0.18	0.26	—	NI
Subglosso-supraglottic level	0.63	<0.001*	0.07 (0.02–0.11)	0.01*

Abbreviations: CI, confidence interval; NI, not included; NS, not significant.

^aMPH: mandibular plane-hyoid distance.

^bPatients might have more than or equal to 1 site of complete lateral wall collapse that collapsibility was more than 90%.

*Two-tailed P-values less than 0.05.