An index is a numerical value to summarize the test result. For speech audiometry, multiple indices exist. They are either based on the scores at specific presentation levels or on the intensity at which a certain score (50%) is reached. Audiqueen makes it easy for you to create different indices. For this open the Manage Indices button in the Format window and add or edit an index.
You first define the name of the index.
Then you choose whether to calculate the index as a average of scores (A) or an intensity at which a certain score is reached (like for speech reception threshold, or speech detection threshold) (B) or it is also possible to calculate the difference between two scores (C). The latter may be interesting, for instance, to calculate a difference between the scores at 70 and 85 dB SPL (indicative for roll-over) (C). For (A), enter the different presentation levels and Audiqueen will calculate the average. For (B), the threshold can be calculated in dB SPL or in dB HL (check ref. Norm, arrow). In the latter case, Audiqueen calculates the difference between the SRT of the patient’s curve and the SRT of the norm curve.
If you check the checkbox ‘Highlight index components on the graph’ (arrow), Audiqueen indicates which points it has used to calculate the index. The index selected in the Index field becomes the one displayed in the grid.