Time and frequency of maximum phonation of normal Thai children in Khon Kaen

The time and frequency of maximum phonation are simple and common clinical tests for evaluating vocal function. The few standard measurements available for Western children are not so appropriate for Thai children. We therefore evaluated 201 normal students, in grades 1-6, from five schools in Khon Kaen Municipality. The maximum phonation times in normal Thai children for the vowel sounds /aː/, /uː/, /iː/ and /s/ measured by Speech Viewer II and a stopwatch were 10.17, 10.15, 10.80, n/a and 10.21, 10.21, 10.40, 7.92 seconds, respectively. The frequencies of maximum phonation time measured by Speech Viewer II for the vowel sounds /aː/, /uː/ and /iː/ were 251.89, 270.02 and 277.78 Hz. The Pearson correlations comparing the Speech Viewer II to the stopwatch were high (0.99-1). The influence factors affecting the time and frequency of maximum phonation are discussed. Our data can serve as a baseline when comparing, diagnosing and treating the maximum phonation time and frequency of patients with voice disorders.

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