. Author manuscript; available in PMC: 2023 Jan 1.

Published in final edited form as: Clin Oral Investig. 2021 Jul 17;26(1):875–887. doi: 10.1007/s00784-021-04066-5

Table 4:

Correlation between UA volumes and protrusion.

	IAH		Protrusion

UA variables	T0	Δ	Maximum	Therapeutic

	p-value (r-value)	p-value (r-value)	p-value (r-value)	p-value (r-value)
Linear
Lateral C2I slice	0.371 (0.211)	0.872 (−0.038)	0.196 (0.302)	0.111 (0.367)
Anteroposterior C2I slice	0.955 (−0.013)	0.523 (0.152)	0.711 (0.089)	0.926 (−0.022)
Lateral C2I slice	0.303 (−0.243)	0.154 (0.331)	0.382 (−0.207)	0.146 (−0.338)
Anteroposterior C4S slice	0.245 (0.273)	0.445 (−0.181)	0.067 (0.418)	0.033 (0.478)
Shape in C4S slice	0.795 (0.062)	0.980 (−0.006)	0.891 (−0.033)	0.999 (0.000)
Shape in C4S slice	0.605 (−0.123)	0.533 (0.148)	0.570 (−0.135)	0.575 (−0.133)
Volumetric
UA total volume
T0	0.278 (0.255)	0.667 (−0.102)	^* *0.004 (0.615)*	^* *0.011 (0.556)*
T1 -T0	0.154 (0.331)	0.302 (−0.243)	^* *0.005 (0.604)*	^* *0.011 (0.558)*
UA total surface area
T0	0.235 (0.278)	^* *0.016 (−0.533)*	^* *0.007 (0.579)*	^* *0.008 (0.572)*
T1 - T0	0.315 (−0.236)	0.353 (−0.219)	0.797 (0.061)	0.616 (0.119)
Superior oropharynx volume
T0	0.257 (0.266)	0.527 (−0.150)	^* *0.018 (0.523)*	^* *0.042 (0.458)*
T1 - T0	0.952 (−0.014)	0.159 (−0.327)	0.220 (0.287)	0.251 (0.269)
Superior oropharynx surface area
T0	0.229 (0.282)	0.207 (−0.295)	^* *0.012 (0.552)*	^* *0.020 (0.517)*
T1 -T0	0.859 (−0.042)	0.524 (−0.151)	0.763 (0.072)	0.769 (0.070)
Inferior oropharynx volume
T0	0.378 (0.208)	0.832 (−0.051)	^* *0.005 (0.606)*	^* *0.009 (0.570)*
T1 - T0	0.397 (−0.201)	0.264 (−0.263)	0.962 (−0.011)	0.836 (0.050)
Inferior oropharynx surface area
T0	0.135 (0.346)	0.569 (−0.135)	^* *0.007 (0.583)*	^* *0.014 (0.542)*
T1 - T0	0.113 (−0.366)	0.255 (−0.267)	0.916 (−0.025)	0.807 (0.058)

p <0.05, Pearson’s correlation. UA = Upper airway, C2I = Most inferior and anterior point of the second cervical vertebra

C4S= Most superior and anterior point of the fourth cervical vertebra.