Type of Noise in Two Groups of Patients Studied Type of Noise Group I Group II Total Continuous 100 (100%) 0 (0%) 100 (50%) Intermittent 0 (0%) 100 (100%) 100 (50%) Total 100 (100%) 100 (100%) 200 (100%) Table 14 Category Type of Impairment I Mild hearing Impairment II a) Moderate hearing Impairment
II b) Severe hearing Impairment III a) Profound hearing Impairment c) Total deafness Category dB Level Percentage (%) of Impairment I 26--40 dBHL in better ear Less than 40% II a) 41--60 dBHL in better ear 40% to 50% II b) 61--70 dB in better 71% to 100% III 71 to 90 dB 100% 91 dB and above in better ear
Public health agency the US Food and Drug Administration announced on Friday that it has approved the marketing of the new Bose Hearing Aid device intended to amplify sounds for individuals 18 years or older with perceived mild to moderate hearing impairment
(hearing loss), which can be caused by ageing, exposure to loud noises, certain medical conditions and other factors.
This bill would make certain types of hearing aids available without a prescription for those Americans with mild to moderate hearing impairment
. The legislation would also require the Food and Drug Administration to rewrite regulations regarding this new category.
Approximately 78% of the healthy years lost were attributable to mild or moderate hearing impairment
. Preventing any occupational hearing loss is the best way to reduce worker hearing impairment over a lifetime, because even mild-to-moderate impairment during working years can culminate in more healthy years lost during retirement.
On the other hand, if we consider referring only those with a PTA score more than 40 dB (moderate hearing impairment
), then only 3% would have been referred from those tested in a soundproof room and 13% from those in the clinical setting.
The hearing impairment definitions are based on unaided thresholds (i.e., thresholds obtained without a hearing aid); therefore, a moderate hearing impairment
or worse in the better ear (i.e., >40 dB HL PTA) was chosen, because individuals with this degree of hearing impairment would likely have considerable listening difficulties in most situations without the use of amplification devices.
Most of these children had either mild or moderate hearing impairment
(37.3% and 25.5%, respectively).
Severity of Hearing Hearing Threshold of Impairment Better Ear Mild Hearing Impairment 26-40 dB Moderate Hearing Impairment
41-60 dB Severe Hearing Impairment 61-80 dB Profound Hearing Impairment >80 dB MATERIALS AND METHODS
Category type of impairment dB Level (Hearing loss) I mild hearing impairment 26-40 dB in better ear II a) moderate hearing impairment
41-60 dB in better ear II b) severe hearing impairment 61-70 dB in better ear III a)profound hearing impairment 71-90 dB b) total deafness 91 dB and above in better MATERIALS AND METHODS SOURCE OF DATA: School going children of 10-13 years of age group were selected from schools across Bengaluru south city.