Table 3 Multiple linear regression for the association between the volumes of the upper airways and maxillary sinuses and the linear measurements of the hard palate

Upper airways

Total volume

HP width (1st PM)

0.189

0.197

(0.082–0.857)

0.018*

HP height (1st PM)

− 0.121

0.147

(− 0.595–− 0.017)

0.038*

HP width (1st M)

− 0.042

0.159

(− 0.398–0.228)

0.593

Nasopharynx volume

HP width (1st PM)

0.198

0.083

(0.045–0.373)

0.013*

HP height (1st PM)

− 0.123

0.062

(− 0.255–− 0.009)

0.035*

HP width (1st M)

− 0.033

0.068

(− 0.162–0.104)

0.669

Oropharynx volume

HP width (1st PM)

0.132

0.105

(0.032–0.446)

0.024*

HP height (1st PM)

− 0.096

0.107

(− 0.386–0.034)

0.100

Maxillary sinuses

Total volume

HP width (1st M)

0.291

0.173

(0.486–1.169)

p < 0.0001*

HP height (1^st M)

0.358

0.229

(0.895–1.798)

p < 0.0001*