We conducted a comparison of three DPOAE protocols, testing cubic 2F1 - F2 distortion products, in order to define the most feasible protocol for a universal hearing screening programme. The protocols used asymmetrical stimulus intensities (L1 > L2) with a frequency ratio of 1.22, in the following format: (P1), L1 = 60, L2 = 50 dB SPL; (P2), L1 = 65, L2 = 55 dB SPL; and (P3), L1 = 75, L2 = 65 dB SPL. Linear TEOAE responses evoked by click stimuli of 75 dB p.e. SPL were used as controls of the normal cochlear function. Five 2F1 - F2 frequencies, 1.5, 2.0, 3.0, 4.0, 5.0 kHz, were tested with a ILO-92 macro subroutine. The project included randomly selected recordings from 1,200 well-baby nursery (WBN) infants (age 48 hours) and 50 very low birth weight NICU infants. Statistical analyses comparing the signal-to-noise ratios (S/N), at the predefined F2 frequencies, indicated that the P1 and P2 DPOAE protocols perform similarly. Significant S/N differences were observed in the P3 to P2 and P3 to P1 data-set comparisons. DPOAE scoring criteria were estimated from the P3 data set, using one-sided distribution-free tolerance boundaries. The scoring criteria for a 'pass' were estimated as a minimum S/N of 6.0, 7.0 and 6.0 dB at 2.0, 3.0 and 4.0 kHz respectively. In terms of feasibility, the P3 protocol generated responses in 98% of the WBN and 76% of the NICU infants. All three DPOAE protocols demonstrated smaller time-recording requirements than the TEOAE standard. The false-positive ratio for the NICU infants was estimated as 8%.
A comparison of distortion product otoacoustic emissions protocols in a universal neonatal hearing screening (UNHS) programme
MARTINI, ALESSANDRO;
2001
Abstract
We conducted a comparison of three DPOAE protocols, testing cubic 2F1 - F2 distortion products, in order to define the most feasible protocol for a universal hearing screening programme. The protocols used asymmetrical stimulus intensities (L1 > L2) with a frequency ratio of 1.22, in the following format: (P1), L1 = 60, L2 = 50 dB SPL; (P2), L1 = 65, L2 = 55 dB SPL; and (P3), L1 = 75, L2 = 65 dB SPL. Linear TEOAE responses evoked by click stimuli of 75 dB p.e. SPL were used as controls of the normal cochlear function. Five 2F1 - F2 frequencies, 1.5, 2.0, 3.0, 4.0, 5.0 kHz, were tested with a ILO-92 macro subroutine. The project included randomly selected recordings from 1,200 well-baby nursery (WBN) infants (age 48 hours) and 50 very low birth weight NICU infants. Statistical analyses comparing the signal-to-noise ratios (S/N), at the predefined F2 frequencies, indicated that the P1 and P2 DPOAE protocols perform similarly. Significant S/N differences were observed in the P3 to P2 and P3 to P1 data-set comparisons. DPOAE scoring criteria were estimated from the P3 data set, using one-sided distribution-free tolerance boundaries. The scoring criteria for a 'pass' were estimated as a minimum S/N of 6.0, 7.0 and 6.0 dB at 2.0, 3.0 and 4.0 kHz respectively. In terms of feasibility, the P3 protocol generated responses in 98% of the WBN and 76% of the NICU infants. All three DPOAE protocols demonstrated smaller time-recording requirements than the TEOAE standard. The false-positive ratio for the NICU infants was estimated as 8%.
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