Table 5 Transfer function estimate evaluation.

From: Utility of the Tympanic Membrane Pressure Waveform for Non-invasive Estimation of The Intracranial Pressure Waveform

PatID N 6-sec time windows Absolute differences between frequency filtered ICP and frequency filtered estimated non-invasive pulsatile ICP Cut-off frequency (Hz)
MWA (mmHg) MWRT (sec) MWRTC (mmHg/sec)
1 462 0.7 ± 0.4 0.03 ± 0.02 3.91 ± 1.81 4
2 666 2.3 ± 1.9 0.1 ± 0.04 6.03 ± 4.67 4
3 409 1.4 ± 1.1 0.02 ± 0.02 5.86 ± 4.08 11
4 1044 8.1 ± 5.6 0.03 ± 0.04 20.55 ± 13.12 4
5 682 1.4 ± 0.8 0.04 ± 0.03 4.29 ± 2.31 3
6 321 0.5 ± 0.5 0.01 ± 0.02 2.77 ± 2.61 6
7 906 0.6 ± 0.3 0.01 ± 0.01 2.07 ± 1.25 2
8 557 0.9 ± 0.5 0.05 ± 0.03 3.26 ± 2.06 3
9 624 0.9 ± 0.6 0.03 ± 0.02 2.01 ± 1.89 4
10 771 2.1 ± 1 0.05 ± 0.03 8.19 ± 4.43 3
11 1311 0.7 ± 0.5 0.03 ± 0.03 7.91 ± 7.06 15
12 601 2.6 ± 1 0.03 ± 0.02 13.38 ± 5.24 6
13 1134 1.4 ± 0.3 16.9 ± 3.5 6.64 ± 1.59 6
14 239 1.2 ± 0.9 0.02 ± 0.02 4.29 ± 2.69 5
15 750 2 ± 0.9 0.1 ± 0.04 17.18 ± 6.83
16 524 0.9 ± 0.4 0.09 ± 0.05 14.11 ± 6.81 11
17 227 0.6 ± 0.4 0.08 ± 0.03 5.72 ± 2.11 5
18 2460 2 ± 1.7 0.05 ± 0.03 7.28 ± 5.3 4
19 330 0.8 ± 0.7 0.03 ± 0.03 6.73 ± 4.83 10
20 1722 1.8 ± 2 0.02 ± 0.02 6.63 ± 7.1 3
21 265 3.5 ± 2.2 0.02 ± 0.02 12.72 ± 8.72 3
22 498 1.6 ± 0.8 0.08 ± 0.03 17.4 ± 5.65 2
23 559 0.4 ± 0.4 0.05 ± 0.03 1.93 ± 1.39 12
24 347 0.8 ± 0.7 0.01 ± 0.01 3.88 ± 3.34 4
25 2957 1.2 ± 0.8 0.1 ± 0.05 8.73 ± 4.02 5
26 420 0.9 ± 0.8 0.01 ± 0.01 3.34 ± 2.9 4
27 2782 2.3 ± 1 0.07 ± 0.03 9.25 ± 3.31 2
28 791 1.7 ± 1.8 0.02 ± 0.02 4.42 ± 4.75 2
AVG ± STD   1.6 ± 1.5 0.06 ± 3.2 7.5 ± 5.0  
SUM 24,359     
  1. MWA: Mean Wave Amplitude. MWRT: Mean Wave Rise Time, MWRTC: Mean Wave Rise Time Coefficient.