National Acoustic Laboratories, Chatswood, NSW, Australia.
Int J Audiol. 2009 Nov;48(11):784-8. doi: 10.3109/14992020903037769.
Long term use of personal stereo players (PSP) is now established as a potential risk to hearing health if exposure levels are not maintained at what are accepted as safe levels. Comparison of PSP user test results indicate that mean listening levels (L(Aeq)) have decreased from 86.1 dB in 2002/03 to 81.3 dB in 2008 and mean exposure levels (L(Aeq,8h)) have decreased from 79.8 dB to 74.7 dB over the same time period, in a user population whose mean age has increased from 23.6 years (SD = 5.7) to 26.0 years (SD = 10.5). This reduction in exposure level of 5 dB also means that the percentage of user population at risk of noise injury and subsequent hearing loss has decreased from 25% to 17% when judged by criterion commonly used for workplace occupational noise exposure standards.
长期使用个人立体声播放器（PSP）如果暴露水平不能保持在可接受的安全水平，现在已被确定为听力健康的潜在风险。PSP 用户测试结果的比较表明，平均听力水平（L(Aeq)）已从 2002/03 年的 86.1 dB 降至 2008 年的 81.3 dB，而在同一时期，平均暴露水平（L(Aeq,8h)）已从 79.8 dB 降至 74.7 dB，用户人群的平均年龄从 23.6 岁（SD=5.7）增加到 26.0 岁（SD=10.5）。暴露水平降低 5dB 也意味着，根据常用于工作场所职业噪声暴露标准的标准判断，处于噪声损伤和随后听力损失风险中的用户人群比例已从 25%降至 17%。
