S/Z Ratio in Dysphonic Children with and without Vocal Cord Nodules

Abstract

The maximum duration times for /s/ and /z/ and the calculated s/z ratio were obtained from 123 dysphonic children, 69 with vocal cord nodules and 54 with no vocal cord pathology. Significant differences were found in the duration of /s/ versus /z/. The s/z ratio was found not to be significantly different for the two groups. The results indicate that the s/z ratio does not discriminate the presence of mass lesions in dysphonic children.

Maximum Duration of Sustained /s/ and /z/ and the s/z Ratio With Controlled Intensity

“…For example, Eckel and Boone 2 took the longest of two trials, and numerous investigators have used the longest of three trials. 8-10, 12 Rastatter and Hyman 11 used the average of five trials. Thus, two additional types of /s/ and /z/ measures were created: (1) the maximum durations and s/z ratios based on the longest of the first three productions of each phoneme, and (2) maximum durations and s/z ratios based on an average of the first three productions of /s/ and /z/.…”

Is There a Relationship between Voice Quality and Obstructive Sleep Apnea Severity and Cumulative Percentage of Time Spent at Saturations below Ninety Percent: Voice Analysis in Obstructive Sleep Apnea Patients

“…In cases where glottic closure is not complete and resonation is impaired, it is expected that the Z-time will decrease and the S/Z ratio will increase [ 48 , 49 ]. Since the glottic area is affected by glottic pathologies such as vocal cord nodules and masses and following thyroplasty surgeries, changes in S/Z ratios may be observed [ 50 , 51 ]. In this study, the MPT was found to be significantly shorter in the moderate and severe OSA groups.…”