Claims for hearing loss

claims for hearing loss

1. CLAIMS FOR HEARING LOSS PRESENTED BY: HIMANI BANSAL

2. COMPENSATION METHODS These are the formula used to convert the degree of HL into a % of impairment for claim of HL Only certain frequencies are used by each formula, and the amount of HL is averaged across them separately for each ear

3. There is a certain minimum amount of HL that must be present before a loss is potentially compensable, i.e., Low fence : it constitutes to 0% impairmenyt High fence : it constitutes to 100% impairment

4. FACTORS FOR CLAIMING Age Gender Presence of congenital HL Presence of unilateral HL Purpose of evaluation Type of noise exposed Duration & intensity of noise exposed Type of noise source Baseline audiogram

5. PERECNTAGE CALCULATION Fletcher formula AMA method AAOO 1959/1971 method AAO-AMA 1979 method NIOSH method CHABA method ASHA 1981 method

6. FLETCHER FORMULA (1929) Hearing levels at 500, 1000 and 2000 were multiplied by 0.8 and averaged. These three frequencies were considered as speech frequencies. It is often called as the point eight rule because it converts a range of losses from 0dB to 128dB into % , so each decibel is worth 0.8%

7. AMA METHOD American Medical Association method Hearing loss at 500, 1000, 2000 and 4000 were multiplied by 0.15, 0.30, 0.40 and 0.15. Binaural percentage is calculated by adding seven times of better ear score to the poorer ear score and divided by 8.

8. AAOO 1959/1971 method The American Academy of Ophthalmology and Otolaryngology (AAOO) Introduced a formula in 1959, updated in 1971, used with the current ANSI standards for audiometers

9. Average of 500Hz, 1000Hz and 2000Hz Low fence of 25dBHL (ANSI, 1969) High fence of 92dBHL 1.5% per dB; counts the better ear five times more than the poorer ear It was proposed that these criteria reflect the ability to hear and repeat sentences Suter (1985) demonstrated that the AAOO formula fails to reflect actual speech recognition problems of HI subjects

10. Monoaural (Average of dB loss-15dB)*1.5=% of loss [for ASA calibration] (Average of dB loss-25dB)*1.5=% of loss [for ISO-ANSI calibration] Bilateral [(% of loss in BE*5) + % of loss in WE]/6=% of binaural loss.

11. AAO-AMA 1979 Method Frequencies considered are 500, 1000, 2000 and 3000 Hz (AMA, 1979) Low fence of 25dBHL and 92dBHL high fence; better ear weighing and % per dB are the same as in the earlier formula Kryter (1998) modified the method by reducing low fence to 15dBHL and high fence to 75dBHL ; adjustment values for presbycusis , and changing the better ear weighting to three instead of five

12. NIOSH Method (1972) Similar to AAO-AMA methods, the 1972 NIOSH formula uses the same frequencies, % per dB, and five times weighting for the better ear It applies these criteria to the average of 1000, 2000 and 3000 Hz, making it one of the most generous compensation formula

13. CHABA Method (1975) It uses a 1000, 2000 and 3000 Hz average but its low fence is raised to 35dB, and a four times better ear weighting is used The low fence was elevated so that compensation awards would be the same as they would have been using the 500, 1000 and 2000Hz average with a 25dB low fence

14. ASHA 1981 Method It involves average of 1000, 2000, 3000 and 4000 Hz, a 25dB low fence; a 75dB high fence, 2% per dB; and a five times weighting for the better ear There is growing support for the 1000-4000 Hz average and it has been adopted with a 25dB low fence as the criterion for material HI by NIOSH (1998)

15. THANKYOU