Table 4.

Pearson's correlation coefficient (R) test in the landmarks.

	Age	ANB	C2C4-SN angle	Palatal angle	NP	PS	UP	TS	EP	SPL	SPW	UE
Vertical
U	0.529∗	−0.135	−0.103	−0.285∗	0.236∗	−0.064	−0.120	0.027	0.134	0.719∗	0.211∗	−0.129
E	0.497∗	−0.059	−0.021	−0.128	0.257∗	0.026	−0.062	−0.097	0.036	0.596∗	0.05	0.469∗
H	0.546∗	−0.055	0.095	−0.132	0.194	0.080	0.030	0.039	0.155	0.553∗	0.056	0.411∗
C2	0.597∗	−0.077	0.127	−0.032	0.261∗	0.063	−0.003	0.157	0.106	0.614∗	0.011	0.130
C4	0.664∗	−0.072	0.137	−0.047	0.369∗	0.161	0.082	0.140	0.090	0.586∗	0.102	0.166
Horizontal
U	−0.010	−0.261∗	−0.263∗	−0.437∗	0.051	0.223∗	0.290∗	0.168	0.123	−0.318∗	0.217∗	−0.118
E	−0.164	−0.268∗	−0.483∗	−0.436∗	−0.180	−0.184	−0.157	−0.054	0.090	−0.087	0.349∗	−0.362∗
H	−0.130	−0.214∗	−0.742∗	−0.512∗	−0.081	−0.248∗	−0.252∗	−0.239∗	−0.108	−0.006	0.397∗	−0.369∗
C2	−0.261∗	−0.183	−0.557∗	−0.523∗	−0.224∗	−0.304∗	−0.323∗	−0.271∗	−0.154	−0.131	0.289∗	−0.300∗
C4	−0.341∗	−0.160	−0.831∗	−0.493∗	−0.234∗	−0.340∗	−0.348∗	−0.366∗	−0.205∗	−0.181	0.323∗	−0.338∗

U: tip of uvula; E: most superior point on the epiglottis; H: most superior and anterior point on the hyoid bone.

C2: inferoanterior point on the second cervical; C4: inferoanterior point on the fourth cervical.

NP: Nasopharyngeal airway; PS: shortest distance from the soft palate to the pharyngeal wall; UP: distance from the uvula to the pharyngeal wall.

TS: shortest distance from the posterior tongue to pharyngeal wall; EP: distance from the epiglottis to the pharyngeal wall.

SPL: Soft palate length; SPW: Soft palate width; UE: short distance from the uvula to the epiglottis.

∗: Statistically significant, P＜ 0.05.