Reliable Jitter and Shimmer Measurements in Voice Clinics: The Relevance of Vowel, Gender, Vocal Intensity, and Fundamental Frequency Effects in a Typical Clinical Task
Reliable Jitter and Shimmer Measurements in Voice Clinics: The Relevance of Vowel, Gender, Vocal Intensity, and Fundamental Frequency Effects in a Typical Clinical Task
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DOI：
10.1016/j.jvoice.2009.07.002
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发表时间：
2011-01-01
期刊：
影响因子：
2.2
通讯作者：
Carding, Paul N.
中科院分区：
文献类型：
--
作者：
Brockmann, Meike;Drinnan, Michael J.;Carding, Paul N.
本研究的目的是检查元音和性别的影响抖动和微光在一个典型的临床语音任务，同时纠正语音声压级（SPL）和基频（F-0）的混杂效应。此外，元音，性别，语音SPL，和F-0的相对影响大小进行了评估，并建议临床测量。采用横断面单队列研究，调查了57名年龄在20-40岁的健康成人（28名女性，29名男性）。使用Praat（软件）分析了“正常”声音响度下的/a/、lot和/i/三种发音。元音，性别，语音SPL，和F-0的抖动和闪烁的影响进行了评估，使用描述性和推理（协方差分析）统计。用η平方统计量确定效应量。元音，性别，语音SPL，和F-0，每个都有显着的影响，无论是抖动或微光，或两者兼而有之。语音SPL是最重要的因素，而元音，性别和F-0的影响相对较小。由于男性的声音SPL系统性较高，因此在校正SPL和F-0时，性别对抖动和微光的影响较小。令人惊讶的是，在临床评估中，语音SPL对抖动和微光的影响最大。元音和性别的影响是临床上重要的，而基频有一个相对较小的影响。在预定义的语音SPL（最小80 dB）和元音（/a/）的发音将提高测量的可靠性。此外，还应制定适用这些准则的针对性别的阈值。然而，这些措施的有效性应得到验证，并与患者进行测试。
The aims of this study were to examine vowel and gender effects on jitter and shimmer in a typical clinical voice task while correcting for the confounding effects of voice sound pressure level (SPL) and fundamental frequency (F-0). Furthermore the relative effect sizes of vowel, gender, voice SPL, and F-0 were assessed, and recommendations for clinical measurements were derived. With this cross-sectional single cohort study, 57 healthy adults (28 women, 29 men) aged 20-40 years were investigated. Three phonations of /a/, lot, and /i/ at "normal" voice loudness were analyzed using Praat (software). The effects of vowel, gender, voice SPL, and F-0 on jitter and shimmer were assessed using descriptive and inferential (analysis of covariance) statistics. The effect sizes were determined with the eta-squared statistic. Vowels, gender, voice SPL, and F-0, each had significant effects either on jitter or on shimmer, or both. Voice SPL was the most important factor, whereas vowel, gender, and F-0 effects were comparatively small. Because men had systematically higher voice SPL, the gender effects on jitter and shimmer were smaller when correcting for SPL and F-0. Surprisingly, in clinical assessments, voice SPL has the single biggest impact on jitter and shimmer. Vowel and gender effects were clinically important, whereas fundamental frequency had a relatively small influence. Phonations at a predefined voice SPL (80 dB minimum) and vowel (/a/) would enhance measurement reliability. Furthermore, gender-specific thresholds applying these guidelines should be established. However, the efficiency of these measures should be verified and tested with patients.