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Yun et al. / Validation of the Korean Voice Handicap Index (K-VHI) and the Clinical Usefulness of Korean VHI-10 ABSTRACT Validation of the Korean Voice Handicap Index (K-VHI) and the Clinical Usefulness of Korean VHI-10 1) Young-Sun Yun a,b,, HyangHee Kim a,c, Young-Ik Son d, Hong Sik Choi e a Graduate Program in Speech and Language Pathology, Yonsei University, Seoul, Korea b Department of Otorhinolaryngology, Voice & Speech Clinic in Head & Neck Center, Samsung Medical Center, Seoul, Korea c Department and Research Institute of Rehabilitation Medicine, Yonsei University College of Medicine, Seoul, Korea d Department of Otorhinolaryngology-Head & Neck Surgery, Sungkyunkwan University School of Medicine, Seoul, Korea e Department of Otorhinolaryngology, the Institute of Logopedics and Phoniatrics, Yonsei University College of Medicine, Seoul, Korea Background & Objectives: The purpose of this study was to validate the Korean Voice Handicap Index (VHI) and VHI-10, and to evaluate the clinical usefulness of VHI-10. Methods: One hundred fifty-six Korean adult patients, all of whom had symptoms of dysphonia without laryngeal cancer, as well as 66 normal Korean adults participated in this study. The survey was conducted using VHI (30 items) and IPVI s first item. Results: With regard to the reliability of VHI-30, Pearson correlations in test-retests were very high (r =.971, p <.01). Cronbach s α for internal consistency was.969. The control group received significantly lower scores than did the patient group. With regard to concurrent validity, the Spearman correlation between the VHI-30 and IPVI s was high (r =.664, p <.01). With regard to the construct validity, 30 VHI items were divided into three components via factor analysis. For VHI-10, statistical analyses revealed high reliability and validity values. The correlations of total scores between VHI-30 and VHI-10 was high (r =.968, p <.01). The mean ratio of total scores between VHI-10 and VHI-30 was 0.368. VHI-10 had a single component according to the results of factor analysis. Discussion & Conclusion: The validity and reliability of VHI-30 and VHI-10 questionnaires are maintained even after translation into Korean. The VHI-10 items are more sensitive than the VHI-30 items, consistent with the results of previous studies. (Korean Journal of Communication Disorders 2008;13;216-241) Key Words: voice disorders, VHI (Voice Handicap Index), VHI-10, quality of life, validation. 1) Some of the data of this paper was excerpted from the doctoral dissertation of the first author, Yun (2007). Received April 20, 2008; final revision received May 20, 2008; accepted June 6, 2008. Correspondence to Young-Sun Yun, PhD, Department of Otorhinolaryngology, Samsung Medical Center, Ilwon-dong, Kangnam-gu, Seoul, Korea, e-mail: voiceyun@hanmail.net, tel.: + 82 2 3410 2355 2008 The Korean Academy of Speech-Language Pathology and Audiology http://www.kasa1986.or.kr 239
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