Beattie Randall C, Kenworthy O T, Luna Christina A
Department of Communicative Disorders, California State University, Long Beach, Long Beach, CA 90840, USA.
Int J Audiol. 2003 Sep;42(6):348-54. doi: 10.3109/14992020309101328.
This study assessed the test-retest reliability of distortion-product otoacoustic emissions (DPOAEs) at four frequencies (550, 1000, 2000 and 4000 Hz) over three time intervals. The time intervals were: (1) immediate test-retest reliability, in which the retest followed the test without any delay or repositioning of the probe tip; (2) very short-term test-retest reliability, in which the retest followed a 10-20-min break and involved removal and re-insertion of the probe tip; and (3) short-term test-retest reliability, in which the retest was conducted 5-10 days after the test. Fifty normal-hearing women were tested with a commercially available system for measuring DPOAEs (Grason-Stadler, GSI-60), which generated primary tones at 65 dB SPL (L1=L2). Standard errors of measurement at 550 Hz (approximately 4.6 dB) were nearly twice as large as those found for 1000 Hz, 2000 Hz, and 4000 Hz (approximately 2.5 dB). The short-term test-retest data suggest that there is a 95% probability that an individual's true DPOAE will fall within 5 dB of the obtained distortion product at 1000-4000 Hz and within 10 dB at 550 Hz. The standard error of measurement of the difference was calculated to assess whether two or more DPOAE measurements are significantly different (e.g. before versus after administration of an ototoxic drug or noise exposure). The data revealed that short-term differences (probe removed and subject retested on the same day or on different days) between two DPOAEs must exceed approximately 14 dB at 550 Hz and 7 dB at 1000-4000 Hz to be statistically significant at the 0.05 level of confidence.
本研究评估了畸变产物耳声发射（DPOAE）在三个时间间隔内于四个频率（550、1000、2000和4000赫兹）的重测信度。时间间隔分别为：（1）即时重测信度，即重测在测试后立即进行，探头尖端无任何延迟或重新定位；（2）极短期重测信度，即重测在休息10 - 20分钟后进行，包括探头尖端的移除和重新插入；（3）短期重测信度，即重测在测试后5 - 10天进行。五十名听力正常的女性使用商用DPOAE测量系统（Grason - Stadler，GSI - 60）进行测试，该系统产生65 dB SPL的初级音（L1 = L2）。550赫兹处的测量标准误差（约4.6 dB）几乎是1000赫兹、2000赫兹和4000赫兹处（约2.5 dB）的两倍。短期重测数据表明，个体的真实DPOAE在1000 - 4000赫兹时落在所获畸变产物5 dB范围内、在550赫兹时落在所获畸变产物10 dB范围内的概率为95%。计算差异测量的标准误差以评估两个或更多DPOAE测量值是否存在显著差异（例如在使用耳毒性药物或噪声暴露前后）。数据显示，两个DPOAE在550赫兹处的短期差异（探头移除且同一天或不同天对受试者重新测试）必须超过约14 dB、在1000 - 4000赫兹处必须超过7 dB，才能在0.05置信水平上具有统计学显著性。
