The difference in peak intraoral pressures between the consonants /p/ and /b/ (abbreviated as Pr./p-b/) showed a significant correlation with the transglottal pressure during consonant /b/ production. The values of Pr./p-b/ in the subjects with vocal fold palsy were smaller than those of the subjects with cancer or polyp. The values of Pr./p-b/ divided by the subglottal pressure in the subjects with cancer showed different distributions from those in the patients with palsy and in normal population. We concluded that these two parameters showed potential benefits for evaluation of pathological conditions of the glottis, especially for insufficient closure of the glottis and stiffness of the vocal folds.
