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NOISE INDUCED HEARING LOSS (NIHL) BSUIR SCIENTIFIC CONFERENCE APRIL 2015 BY ROMAN MATVEEV H I N L o i s e n d u c e d e a r i n g o s s Introduction to NIHL NIHL is “a hearing impairment resulting from exposure to high levels of noise”, and it is also commonly known as industrial deafness. Statistics NIHL Irreversible Reversible hearing hearing loss loss Intensity↔Pitch INTENSITY Intensity = 20logreferenceparticular 20dB=10*log1020 20dB=10*0dB 40dB=100*20dB 60dB=1000*40dB 85dB Noise Level 94 dB Movie 99 dB Snowmobile 110 dB Video Arcade 115 dB Motorboat 120 dB Rock concert 127 dB Sporting events 154 dB Car stereo 167 dB Gunshot 180 dB Firecracker Table 2 PITCH 20Hz NIHL The upper limit of hearing range The lowest limit of hearing range 20004000Hz 20,000Hz Table 1 Approximate Decibel Level Examples 0 dB The quietest sound you can hear 30 dB Whisper, quiet library 60 dB Normal conversation, sewing machine, typewriter 90 dB Lawnmover, truck traffic Maximum daytime exposure: 8 hours 100 dB Chainsaw, drill, snowmobile Maximum daytime exposure: 2 hours 115 dB Sandblasting, loud rock concert, auto horn Maximum daytime exposure: 2 hours 140 dB Gun blast, jet engine Noise causes pain and injures to unprotected ears. Maximum allowed noise with hearing protector How our hearing works MicroFilm: How Our Hearing Works Like blades of grass… Means of Ear Protection Earmuffs Earplugs Conclusion: We should remember NIHL is entirely preventable but once acquired it is irreversible. The haircells never grow back, they are unrecoverable. That is why we should take care today. Statistics of NHIL claims Number of Claims for NIHL 1998-99 1999-2000 2000-2001 2001-2002 Claims for NIHL 5755 5280 5185 4510 Percentage of Total Disease Claims 24 22 21 19 Percentage of Total Disease and Injury Claims 3.8 3.5 3.5 3.2 Claims in SA decreased from 370 in 1999 to 190 in 2002 Although the number of NIHL claims has been reduced, it does not mean that noise induced deafness has been reduced *most recent data available (2006) NIHL Claims per Exposed Employees (2001/2) 1200 1000 800 600 400 200 Tr ad e na nc e Fi es Se rv ic un ity ns po rt re ul tu in Ag ric Ad m Pu bl ic ct io n Co ns tru ur in g an uf ac t wa te r M Tr a Co m m ec tri ci ty , ga s & M in in g 0 El Number of claims per hundred thousand employees Statistics of NHIL claims The highest number of claims are made by: Labourers and related workers, 33% Tradespersons and related workers, 30% Intermediate production & transport workers (plant or machine operators or transport drivers). Statistics of NHIL claims The average cost of workers compensation claims for NIHL in 2001/2 was calculated to be $6711. Therefore, for Australia, the direct cost of NIHL claims for 2001/2 is calculated to be $6711 x 4510 claims i.e. just over $30 million. This figure does not include Hearing Aid fittings Prevention NIHL Noise Control and Hearing Loss Prevention Program Actions to reduce noise exposure eg. Noise insulation, ear protection Actions to monitor the health of employees eg, annual hearing screening programs Establishing a noise control policy and program noise control policy and program will enable a systematic approach to hearing conservation in a company eg purchasing policy on equipment noise levels, mandatory ear protection, training programs for employees