Liaqat Ali.
Comparison of warble tone and pure tone thresholds using insert earphones in adolescents.
Pak J Pathol Jan ;12(3):95-102.

Thiry adolescents with normal hearing who served as subjects were selected. Each subject was allowed to sit comfortably on a chair and ears were examined. Tympanometry was done. Each subject was tested with pure tone as well as warble tone thresholds. An ear tone-3A insert earphone with disposable foam ear tip was inserted, initially by squeezing the foam ear tip and keeping for a few seconds, allowing it to inflate and affix in the test ear. Subject was presented with a tone of 40dBHL at 1000Hz in test ear and then decreased in 10dB steps to inaudibility. Each subjects pure tone and warble tone thresholds at 4 frequencies (ie 500, 1000, 2000 and 4000Hz) were obtained monaurally for test ear. RESULTS: Threshold difference between the warble tone and pure tone was not more than 5dB at any of the test frequency. Difference between then mean thresholds for the two stimuli ranged from 0.84dB at 1000Hz to 1.0dB at 2000Hz and 4000Hz. Mean warble tone thresholds were consistently better than pure tone thresholds except at 500Hz at which, these were the same. When the data were compared by using chi-square, it was found non significant (p=1.000). However, statistical difference showed no significant differences between warble tone and pure tone thresholds at 500Hz but there were significant differences between the two tone threshold levels at 1000Hz (p=0.023), 2000Hz (p=0.012) and 4000Hz (p=0.012).

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