Musiba Z
African Barrick Gold, Occupational Health and Safety, Plot 1736, Hamza Aziz Road, Msasani Peninsula, Dar es salaam 19966, United Republic of Tanzania.
Occup Med (Lond). 2015 Jul;65(5):386-90. doi: 10.1093/occmed/kqv046. Epub 2015 Apr 28.
Tanzania has a young mining history with several operating open pit and underground mines. No prevalence studies of noise-induced hearing loss (NIHL) have been conducted among mine workers to provide an impetus for the development of comprehensive hearing protection programmes.
To determine the prevalence of NIHL and associated factors among miners in a major gold mining company operating in Tanzania. Associated risk factors such as age, sex and duration of exposure were examined.
Audiograms obtained from periodic medical examinations were categorized using the UK Health & Safety Executive system.
A total of 246 audiograms were studied. The prevalence of NIHL was 47%, with 12% with poor hearing and 35% with mild hearing impairment. The proportion of NIHL increased with total years of exposure to noise. Underground miners were more affected (71%) than open pit miners (28%). These findings were statistically significant. The highest proportion of miners with NIHL (60%) was among the youngest age group (20-29 years).
There was a high prevalence of NIHL in the company under study. There was a strong correlation with type of mining, age and years of exposure. The findings have been used to develop comprehensive hearing conservation programmes.
坦桑尼亚的采矿历史较短，目前有多个露天矿和地下矿在运营。尚未对矿工进行噪声性听力损失（NIHL）患病率研究，以推动全面听力保护计划的制定。
确定在坦桑尼亚运营的一家大型金矿公司中矿工的NIHL患病率及相关因素。研究了年龄、性别和暴露时长等相关风险因素。
使用英国健康与安全执行局系统对定期体检获得的听力图进行分类。
共研究了246份听力图。NIHL患病率为47%，其中听力差的占12%，轻度听力损伤的占35%。NIHL比例随噪声暴露总年限增加而上升。地下矿工受影响更大（71%），高于露天矿工（28%）。这些发现具有统计学意义。NIHL比例最高（60%）的是最年轻年龄组（20 - 29岁）。
在所研究的公司中，NIHL患病率较高。与采矿类型、年龄和暴露年限有很强的相关性。这些发现已用于制定全面的听力保护计划。
