There was no significant change from preoperative baseline in pure-tone average
or speech discrimination score in any patient.
Standardized methods for pure-tone average
(PTA), speech discrimination score (SDS), stapedius reflex testing, and tympanometry were used to evaluate the patients.
(PTA) thresholds across 0.5, 1.0, and 2.0 kHz are shown for each subject in Table 1.
We computed pure-tone average
(PTA) at speech frequencies (0.5, 1, 2, and 4 kHz; speech-PTA) and high frequencies (3, 4, and 6 kHz; high-PTA) (Agrawal et al.
[Figure 1] shows Spearman's correlation between disease duration and pure-tone average
( r [sub]s = 0.288, P = 0.002).
When thresholds were greater than 20 dB on the hearing level (HL) scale (dB HL) and exhibited a ratio of low-frequency pure-tone average
(LFPTA; 500-2,000 Hz) over high-frequency pure-tone average
(PTA) (3,000-6,000 Hz) that was [greater than or equal to] 1.5 for the same ear, the subject's audiogram was disqualified because this configuration would not be associated with hazardous noise exposure.
They conclude that it is a feasible screening test to rule out significant hearing loss (pure-tone average
> 40 dB).
MAIN OUTCOME MEASURE: Hearing loss, defined as audiometric threshold values of at least 16-dB hearing level based on a low or high pure-tone average
. RESULTS: A total of 14.9% of children had low-frequency or high-frequency hearing loss of at least 16-dB hearing level, 7.1% had low-frequency hearing loss of at least 16-dB hearing level, and 12.7% had high-frequency hearing loss of at least 16dB hearing level.
The researchers evaluated hearing impairment as a pure-tone average
greater than 25 decibels hearing level in either ear, and also measured word recognition at different sound levels and with male and female voices.
A longer, 25-item version of the scale was found to correlate with objective measures of hearing (p < .01) including pure-tone average
(r = 0.61), spondee threshold (r = 0.59) and speech recognition (r = 0.42).
Successful treatment was defined as at least a 50% recovery of four-frequency pure-tone average
relative to the unaffected, contralateral ear.
At audiometry, the air conduction pure-tone average
(PTA) and bone conduction PTA of the right ear were 50 and 30 dB hearing level (HL), respectively.