Determination of the vocal folds lengths in children
Abstract
The study was aimed at deriving the formula for the length of vocal folds in children based on anthropometric data. The study covered 916 children of the age 1 to 17 years having no larynx pathology who appealed to children's polyclinic №3 of Irkutsk in 2014 - 15. The studied parameters included the body weight and height as well as the length of vocal folds. The latter was measured using ultrasonic scanning apparatus “ALOKA SSD-500” with the standard transducer frequency of 5 MHz. Using the software Statistica 8.0 a linear regression model was created to calculate the length of vocal folds in children. It appeared to be equal to 0,24578 x age (years) + 1,83570 x gender (1 - female, 2 - male) + 0,08853 x height (cm) + 0,06940 x weight (kg) - 3,51422. The determination coefficient of the model R2=0,827 was at a significance level of p<0.05. The proposed formula can be used to determine the type of the singing voice in vocal beginners as well as for diagnostics of larynx hypoplasia as a cause of its functional disorder.
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