بررسی وضعیت و عوامل موثر در حفاظت شنوایی کارگران صنایع بزرگ شهر همدان در سال 81-1380

Noise induced hearing loss in adults&nbsp;is the most cause of sensory neural&nbsp;hearing loss after the presbycusis and industry workers severity affect by&nbsp;degenerative results of that. &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Three large works of Hamadan city which had more than 200 Workers&nbsp;were selected in this demonstrative quest . The mean of sound pressure level&nbsp;evaluated with sound level meter which amount to 82-95 dB. Total exposed&nbsp;workers with higher noise than 85 dB evaluated by pure tone audiometery&nbsp;and otoscopic evaluation and the means of hearing thresholds in four &nbsp;&nbsp; frequency :0.5,1,2,4 kHz balanced with previously . Method of concentration&nbsp;data was direct observation and questionnaire . &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 809 workers in local works exposed to invasive noise . 20.02% of them&nbsp;hadn&rsquo;t any hearing protector and 79.98% had , which combinated of wax&nbsp;or dry cotton and fiber glass (76.20%), earplug (7.42%)and earmuff(16.38%).&nbsp;The means of hearing thresholds workers with protector equal to 43.36 dB&nbsp;and without that was equal to 44.03 dB (t=0.29, Pv<0.05). Highest &nbsp;&nbsp;percentage quantity in two groups related to age &ndash;bracket 40-49 years old.&nbsp;Women with protection(9.43%)were more than without protector(3.7%)&nbsp;while the most percentage related to men without protector (96.3% in&nbsp;contrast to 90.57%).In totally highest percentage quantity of NIHL was in&nbsp;workers with past-working more than 15 years (67.54% with protector ,&nbsp;67.28%without protector). For awareness of degenerative results the noise in &nbsp;&nbsp; hearing large industry workers of Hamadan city&nbsp;75% insignificant and 25%&nbsp;had efficient awareness . &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Not using of protectors by 20.2% of worker showing light awareness to&nbsp;degenerative results of noise on hearing system and poor educational&nbsp;healthing and noting difference in means of hearing loss at protected&nbsp;group on basis duration of using that, strikes the process of hearing&nbsp;conservation program is superficial.