Türkçe Konuşan Yetişkinlerde Kepstral Spektral Disfoni İndeksinin (Cepstral Spectral Index Of Dysphonıa-Csıd) Geçerliğinin Araştırılması
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Frequency domain measurements of voice have been popularly used recently, as they allow voice analysis in connected speech and provide more reliable results in the evaluation of severe voice disorders. Although there are validity studies in other languages for the Cepstral Peak Prominence (CPP) and Cepstral Spectral Index of Dysphonia (CSID) indices, there is no validity study for Turkish. The aim of this study is to perform a validity study for these frequency-domain measurements and CSID which derived from these measurements. 195 adults with dysphonia were included in the study, and 195 adults with normal voice quality matched with those adults in terms of gender and age were included. Participants uttered the sustained vowel /a/ and read Consensus Auditory-Perceptual Evaluation of Voice (CAPE-V/Turkish) sentences. The auditory perceptual evaluation was made according to the Overall Severity in sustained vowel /a/ and the Overall Severity of CAPE-V/Turkish involvement, and than participants were divided into four groups; normal voice, mild, moderate and severe dysphonia. Analysis of Dysphonia in Speech and Voice (ADSV) software was used for acoustic analysis. Voice handicap index (VHI) was used as a self-assessment tool. It was observed that CPP, L/H and CSID parameters differed significantly among all dysphonia groups. Pearson correlation analysis between perceptual and acoustic assessments showed a high correlation (r>0,800) for CPP and CSID parameters at each assessment step. Pearson correlation analysis performed to test the relationships between VHI and frequency domain measurements. The highest correlation was observed in the CSID parameter, and these correlations were found to varying degrees, moderate to high. ROC curve analysis for sustained vowel /a/ and connected speech, the AUC value for CPP and CSID was greater than 0,800. The CPP cut-off scores for sustained vowel /a/ and connected speech were 10,049 (AUC: 0,905), 4,662 (AUC: 0,862) and for CSID 10,8 (AUC: 0,961), 15,677 (AUC: 0,904) respectively. Present showed that CSID and frequency domain measurements are valid in distinguishing between dysphonia and normal voice in Turkish-speaking adults.