500Hz logon versus click ABR maturation.

OBJECTIVES: To provide age-equivalent norms for a 500Hz logon evoked ABR obtained in a group of children ranging 40 weeks-4 years old and compare these 500Hz tonal norms to age-equivalent norms for click-evoked ABR. METHODS: Seventy-seven infants and children ranging from conceptional age of 40 weeks (term babies) to 4 years were tested with both click and tonal ABR without any risk factors for hearing loss. RESULTS: Data analyses were consisted of 6 age groups. Mean wave V latencies were compared with the adult norms. Latencies were decreased by age in both click and tonal ABR recordings. CONCLUSION: Five hundred Hertz of tonal ABR wave V latency did not mature until to 2-4 years old but, click ABR wave V latency reached maturity at the same age range.