What is ENT - What is the standard deviation of the clear tones?
A person's capacity to hear within three important speech frequencies is estimated using the PTA. The number is determined by taking the average of the hearing thresholds determined through air conduction at frequencies of 500, 1000, and 2000 Hz. Fletcher's average, which is the average of the two best thresholds that are generally used to obtain the PTA, is the threshold that is most commonly used for individuals who have a hearing loss that is gradually getting worse over time. Instead of measuring a person's actual hearing capacity, the PTA is used to evaluate their reliability.
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