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Original Article

Test-retest reproducibility of the 1000 Hz tympanometry test in newborn and six-week-old healthy infants

, , , &
Pages 815-822 | Received 10 Oct 2009, Accepted 11 May 2010, Published online: 29 Jul 2010
 

Abstract

Abstract

This study aimed to evaluate the test-retest reproducibility of the high frequency tympanometry (HFT) test measured in healthy infants. A total of 273 newborn babies (106 males and 147 females) were assessed twice (Test 1 and Test 2) on the same day, followed by two more assessments (Test 3 and Test 4) for 118 babies (48 males and 70 females) who returned six weeks later. Five HFT measures including the peak compensated static admittance and component compensated static admittance were assessed for test-retest reproducibility. The results showed no significant differences in mean values of the HFT results between the test and retest conditions for newborn (Test 1/ Test 2) and six-week-old babies (Test 3/ Test 4). High reproducibility for all HFT measures was found for both age groups, as judged by the high intra-correlation coefficients of between 0.75 and 0.95. Normal variations of the HFT measures were established using the 90% range of absolute test-retest difference. Changes in test-retest findings exceeding the 95th percentile values may be considered significant, indicating possible functional changes.

Sumario

Este estudio tiene como objetivo evaluar la reproducibilidad de la timpanometría de alta frecuencia (HFT) medida en infantes sanos. Un total de 273 neonatos (106 hombres y 147 mujeres) se evaluaron dos veces (prueba 1 y prueba 2) en el mismo día y 118 (48 hombres y 70 mujeres) fueron evaluados otras dos veces (prueba 3 y prueba 4) al regresar 6 semanas después. Se ejecutaron cinco mediciones de HFT, incluyendo el pico de admitancia estática compensada y el componente de admitancia estática compensada, para evaluar la reproducibilidad test-retest. Los resultados no mostraron diferencias significativas en los valores promedio de los resultados HFT entre el test y el re-test en los neonatos (prueba 1 y prueba 2) y los infantes de seis semanas (prueba 73 y prueba 4). Se encontró una alta reproducibilidad para todas las mediciones en ambos grupos de edad, como lo demuestran los altos coeficientes de correlación interna de entre 0.75 y 0.95. Se establecieron las variaciones normales utilizando el 90% del rango de la diferencia absoluta test-retest. Los cambios en los hallazgos test-retest que excedieron el percentil 95 pueden considerarse significativos, lo que indica posibles cambios funcionales.

Acknowledgements

The authors wish to acknowledge the generous support of GN Otometrics A/S (Denmark) in this research project.

Declaration of interest: The authors report no conflict of interest. The authors alone are responsible for the content and writing of this paper.

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