Exposure to excessive sounds and audiometric hearing threshold levels were determined in university music students.
Hearing threshold levels (HTLs) for air conduction at frequencies 250-8000 Hz were determined using the ascending-descending technique in 5-dB steps.
The hearing threshold levels
in the dental hygienists with high-ultrasonic scaler usage was found to be higher than the threshold levels in dental hygienists with a low-ultrasonic scaler usage at the same frequency.
Generally, the averaged audiometric hearing threshold levels
of the 18 musicians (36 ears) do not exceed 15 dB HL, which indicates a good state of their hearing (Figure 1).
In this study we have seen that high level of noise has deleterious effect on hearing threshold level
of human being at speech frequency as well as at 4000 Hz frequency.
Comparison of the standardized hearing threshold levels
(SHTLs) (relative to age-, gender- and noise exposure- equivalent population) in subgroups of workers a) with higher (> 78 mm Hg) and lower [less than or equal to]] 78 mm Hg) diastolic blood pressure, and b) with higher (> 129 mm Hg) and lower ([less than or equal to] 129 mm Hg) systolic blood pressure
There were no differences in hearing threshold levels
from day 0 to day 3 or from day 3 to day 7 (P between 0.1 and 0.9, signed rank test for all frequencies/ears and both days, data not shown).
Preferred test conditions for the determination of reference hearing threshold levels
There was a significant difference in hearing threshold levels
at these frequencies.
After audiometric testing, hearing threshold levels
were averaged for the speech frequencies of 1, 2, & 3KHz.
From the audiogram, the mean Hearing Threshold Levels
(HTL) of both ears based on different age groups and different service groups were calculated and compared with that of controls.
It also examined the crossover effect between right-handed clinicians and left-ear hearing threshold levels