Table 1.

Group means (SDs) for participant characteristics and auditory brainstem response measures

Good readersAverage readersPoor readers
Age (months)112.0 (16.3)112.9 (19.0)124.7 (22.1)
IQ115.4 (16.7)103.5 (17.4)97.4 (13.7)
Attention Rating Scale Percentile47.9 (29.0)50.3 (32.7)68.8 (24.2)
Brainstem response consistency (r)
    First half/second half (n = 100)
        7–60 ms0.671 (0.13)0.615 (0.14)0.537 (0.16)
        60–180 ms0.684 (0.14)0.641 (0.14)0.571 (0.18)
    Even events/odd events (n = 64)
        7–60 ms0.727 (0.11)0.686 (0.14)0.609 (0.16)
        60–180 ms0.703 (0.11)0.665 (0.16)0.609 (0.16)
    Click-evoked responses (n = 96)0.771 (0.16)0.813 (0.16)0.779 (0.15)
        Prestimulus amplitude (μV)0.092 (0.02)0.092 (0.02)0.100 (0.02)
        Response amplitude (μV)0.202 (0.06)0.184 (0.03)0.213 (0.09)
  • Group differences in neural measures are seen for the consistency of the brainstem response to speech only, and are not mediated by participant characteristics such as age, IQ, and attention.