The acceptable noise level: The effect of repeated measurements
The acceptable noise level: The effect of repeated measurements
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DOI：
10.3109/14992027.2013.824116
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发表时间：
2014-01-01
影响因子：
2.7
通讯作者：
Olsen, Steen Ostergaard
中科院分区：
文献类型：
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作者：
Brannstrom, K. Jonas;Holm, Lucas;Olsen, Steen Ostergaard
目的：探讨增加重复次数是否可以提高可接受噪声水平（ANL）测试的精度。设计：我们测量了12个ANL重复，即4个完整的ANL测试（4 x 3个重复），在一个会话中使用diotic演示和非语义ANL版本。研究样本：32名听力正常的成年人。结果：观察到小阶效应和疲劳效应。采用重复性系数（coefficient of repeatability， CR）评价重复性；四种ANL测试的CRs范围在3.9至7.6 dB之间。使用12个ANL重复，我们通过将数据归一化为12个重复的个体平均ANL来消除ANL在受试者之间的可变性。12次重复时，被试的平均归一化ANL迅速接近个体平均归一化ANL (0 dB)，重复3次后，SD似乎稳定在3 dB左右。结论：顺序和疲劳对ANL均有影响。研究结果还表明，它可能比ANL更准确地描述可接受的噪声范围。这些发现对我们如何理解可接受的噪音有很大的影响，它可以解释听力正常和听力受损受试者之间的很大一部分差异。
Objective: This study explores if increasing number of repetitions might improve the precision of the acceptable noise level (ANL) test. Design: We measured twelve ANL repetitions, i.e. four complete ANL tests (4 x 3 repetitions), at one session using diotic presentation and a non-semantic ANL version. Study sample: Thirty-two normal-hearing adults. Results: Small order and fatigue effects were seen. We used the coefficient of repeatability (CR) to assess the repeatability; CRs ranged between 3.9 and 7.6 dB for the four ANL tests. Using the twelve ANL repetitions we removed the variability of the ANL across subjects by normalizing the data to the individual mean ANL for the twelve repetitions. The mean normalized ANL across the subjects rapidly approached the ANL normalized to the individual mean for the 12 repetitions (0 dB), and after three repetitions the SD seemed to be stable at about 3 dB. Conclusions: The findings suggest that both order and fatigue affect the ANL. The findings also suggest that it may be more accurate to speak of an acceptable noise range than ANL. These findings have large implications for how we understand acceptable noise and it would explain a large part of the variability seen among normal-hearing and perhaps hearing-impaired subjects.