James C J, Laborde Marie-Laurence, Algans C, Tartayre M, Cochard N, Fraysse B, Deguine O, Marx M, Karoui C
Cochlear France SAS, Toulouse, France.
Service ORL, Hôpital Purpan, Toulouse, France.
Int J Audiol. 2023 Apr;62(4):304-311. doi: 10.1080/14992027.2022.2045368. Epub 2022 Mar 15.
The "Marginal benefit from acoustic amplification" version 2 (MBAA2) sentence test has been used in France in the routine evaluation of cochlear implant (CI) users for 20 years. Here we present four studies that characterise and validate the test, and compare it with the French matrix sentence test.
An analytic method was developed to obtain speech recognition threshold in noise (SNR50) from testing at a fixed signal to noise ratios (SNRs). Speech recognition was measured at several fixed SNRs in 18 normal-hearing listeners and 15 CI listeners. Then, the test-retest reliability of the MBAA2 was measured in an additional 15 CI listeners. Finally, list equivalence was evaluated in eight CI listeners.
The MBAA2 test produced lower SNR50s and SNR50s were obtained in more CI listeners than with the French matrix test. For the MBAA2, the standard deviation of test-retest differences in CI listeners was around 1 dB SNR. Three lists had deviant difficulty and nine low item-to-total correlations.
We propose to reduce the number of MBAA2 test lists to reduce variability. The MBAA2 test has high test-retest reliability for percent correct and SNR50, and is suitable for the assessment of cochlear implant patients.
“声学放大的边际效益”第2版（MBAA2）句子测试在法国已用于人工耳蜗（CI）使用者的常规评估达20年。在此，我们展示四项对该测试进行特征描述和验证并将其与法国矩阵句子测试进行比较的研究。
开发了一种分析方法，通过在固定信噪比（SNR）下进行测试来获取噪声中的语音识别阈值（SNR50）。在18名听力正常的听众和15名CI使用者中，于几个固定SNR下测量语音识别。然后，在另外15名CI使用者中测量MBAA2的重测信度。最后，在8名CI使用者中评估列表等效性。
MBAA2测试得出的SNR50更低，且与法国矩阵测试相比，更多CI使用者获得了SNR50。对于MBAA2，CI使用者重测差异的标准差约为1 dB SNR。三个列表存在异常难度，九个项目与总分的相关性较低。
我们建议减少MBAA2测试列表的数量以降低变异性。MBAA2测试在正确率和SNR50方面具有较高的重测信度，适用于人工耳蜗植入患者的评估。
