Best-fit model of Brainstem encoding of speech and Speech in Noise perception (SIN-cABR). Brainstem measures assessing the ability to utilize stimulus regularities, faithfully encode lower harmonics of the stimulus, and resilience to timing shifts in background noise predicted of 56% of the variance in Speech in Noise perception. All relationships between observed and construct factors were significant and R2 values are indicated. (Overall fit: χ2 = 5.03, χ2/df = 1.3, p = 0.28, RMSEA = 0.056).