International Scholarly Research Notices / 2011 / Article / Tab 2

Research Article

Diagnostic Potential of Distortion Product Otoacoustic Emissions in Noninvasive Assessment of Elevated Intracranial Pressure: Different Patterns of DPOAE Alterations in the Guinea Pig

Table 2

Mean and range of ICP-induced DPOAE level changes (Ξ”DP), range of the standard deviation during elevated ICP (SDICP), and number of valid intervals for different frequencies 𝑓 2 . MeanΞ”DP, rangeΞ”DP, and   r a n g e S D I C P   are given in dB SPL. See Section 2.3 for calculations and inclusion criteria. Significant changes are indicated by an asterisk.
(a) First pattern of DPOAE level alterations attributed to altered sound transmission. Note that there is a significant DPOAE level decrease only at 𝑓 2 = 2 kHz

𝑓 2 = 2 kHz 𝑓 2 = 4 kHz 𝑓 2 = 8 kHz 𝑓 2 = 12 kHz 𝑓 2 = 16 kHz

MeanΞ”DPβˆ’3.17*βˆ’0.69βˆ’0.13+0.20βˆ’0.53
RangeΞ”DPβˆ’8.05–+1.13βˆ’4.42–+1.43βˆ’1.26–+1.28βˆ’0.63–+2.51βˆ’1.55–+0.61
R a n g e S D I C P 0.83–1.660.35–2.060.34–0.740.36–1.330.21–1.13
Number of valid intervals1012141413

(b) Second pattern of DPOAE level alterations that might be attributed to reduced CoBF. Note the pronounced DPOAE level decrease at all measured frequencies and the much larger SDICP

𝑓 2 = 2 kHz 𝑓 2 = 4 kHz 𝑓 2 = 8 kHz 𝑓 2 = 12 kHz 𝑓 2 = 16 kHz

MeanΞ”DPβˆ’2.80βˆ’7.66βˆ’9.76βˆ’11.47βˆ’12.36
RangeΞ”DPβˆ’1.53β€“βˆ’3.98βˆ’1.97β€“βˆ’13.46βˆ’3.67β€“βˆ’14.25βˆ’5.25β€“βˆ’22.18βˆ’4.44β€“βˆ’21.36
R a n g e S D I C P 3.83–7.363.74–12.843.00–10.247.27–17.515.25–13.56
Number of valid intervals45555

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