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This project aims to validate a newly developed Arabic Digits-In-Noise (DIN) test by examining relations between Arabic DIN thresholds (both diotic and antiphasic) and pure-tone audiometric (PTA) thresholds, in an audiometrically diverse sample of listeners. In the diotic version of the DIN test, identical stimuli are presented binaurally (ie, diotic speech and noise, SoNo). The antiphasic version of the DIN test (in which speech is presented 180 degrees out of phase between the ears, SπNo) is believed to be superior to the diotic version in its capacity to predict worse-ear PTA thresholds (De Sousa et al., 2020, 10.1097/AUD. 0000000000000775; De Sousa et al., 2021, 10.1097/AUD. 0000000000001160). To determine whether the same is true of the Arabic versions, our main analyses will resemble those of De Sousa et al.(2020), in order to facilitate comparison with the earlier work. However, exploratory analysis using alternative analysis models advised by biostatisticians at the University of Manchester will also be employed. There are four primary inferential research questions: 1. Are diotic DIN thresholds related to worse-ear PTA thresholds after controlling for age? 2. Are antiphasic DIN thresholds related to worse-ear PTA thresholds after controlling for age? 3. Are antiphasic thresholds more strongly related to PTA thresholds than are diotic DIN thresholds? 4. Is the regression line between worse-ear PTA thresholds and DIN thresholds steeper for antiphasic than diotic stimuli? In addition to the primary inferential questions, we will emulate the non-inferential research question of De Sousa et al.(2020), by descriptively examining the predictive …