Table 2 Results of estimating pulsatile ICP based on Transfer function from each individual.

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

PatID N 6-sec time windows Original invasive static and pulsatile ICP Absolute differences between original ICP and estimated non-invasive pulsatile ICP
Mean ICP (mmHg) MWA (mmHg) MWRT (sec) MWRTC (mmHg/sec) MWA (mmHg) MWRT (sec) MWRTC (mmHg/sec)
1 462 3.5 ± 1.7 4.2 ± 0.4 0.23 ± 0.02 18.8 ± 1.4 1.6 ± 0.5 0.05 ± 0.03 8.9 ± 2.1
2 666 8.6 ± 3.6 5.3 ± 1.5 0.20 ± 0.04 27.6 ± 7.0 2.3 ± 1.8 0.15 ± 0.05 12.7 ± 8.3
3 409 6.1 ± 1.3 8.0 ± 0.9 0.26 ± 0.01 31.1 ± 3.4 1.6 ± 1.1 0.02 ± 0.02 7.4 ± 4.4
4 1044 33.9 ± 8.6 19.9 ± 7.8 0.31 ± 0.04 64.7 ± 29.6 8.0 ± 6.7 0.07 ± 0.04 32.2 ± 27.2
5 682 13.4 ± 3.7 3.8 ± 0.9 0.25 ± 0.03 15.7 ± 3.2 1.5 ± 1.0 0.11 ± 0.04 7.9 ± 4.7
6 321 6.1 ± 0.9 3.3 ± 0.2 0.19 ± 0.01 18.6 ± 1.0 0.9 ± 0.6 0.02 ± 0.02 6.1 ± 3.0
7 906 21.6 ± 3.5 4.5 ± 0.8 0.11 ± 0.03 8.2 ± 12.8 2.4 ± 0.7 0.10 ± 0.06 35.5 ± 9.8
8 557 0.8 ± 0.8 2.4 ± 0.5 0.12 ± 0.03 23.5 ± 4.4 1.2 ± 0.5 0.16 ± 0.06 19.3 ± 4.8
9 624 2.9 ± 2.2 6.2 ± 0.8 0.29 ± 0.02 21.4 ± 3.8 0.7 ± 0.6 0.04 ± 0.02 4.2 ± 2.9
10 771 16.4 ± 5.6 5.7 ± 1.3 0.21 ± 0.02 27.0 ± 5.0 3.0 ± 1.6 0.11 ± 0.04 17.8 ± 6.9
11 1311 4.9 ± 0.6 3.7 ± 0.3 0.10 ± 0.02 39.7 ± 3.0 1.2 ± 0.6 0.03 ± 0.03 16.9 ± 7.2
12 601 18.1 ± 2.8 7.8 ± 0.5 0.21 ± 0.01 37.7 ± 2.7 3.4 ± 1.1 0.04 ± 0.03 19.8 ± 5.6
13 1134 6.3 ± 1.3 2.4 ± 0.2 0.14 ± 0.04 20.1 ± 3.9 0.8 ± 0.4 0.09 ± 0.04 13.4 ± 4.5
14 239 19.5 ± 2.0 7.2 ± 0.9 0.26 ± 0.03 28.8 ± 4.3 1.8 ± 1.1 0.04 ± 0.03 8.8 ± 4.4
15 750 7.9 ± 3.4 5.6 ± 1.2 0.13 ± 0.05 49.9 ± 11.7 2.4 ± 1.1 0.11 ± 0.06 33.4 ± 12.8
16 524 1.2 ± 1.3 3.4 ± 0.5 0.18 ± 0.05 25.2 ± 7.0 1.2 ± 0.5 0.09 ± 0.05 16.7 ± 6.8
17 227 6.3 ± 1.3 3.0 ± 0.4 0.12 ± 0.03 28.6 ± 4.0 1.2 ± 0.6 0.16 ± 0.05 21.8 ± 4.6
18 2460 13.8 ± 2.9 7.5 ± 1.3 0.24 ± 0.02 32.1 ± 5.1 2.3 ± 1.6 0.07 ± 0.03 11.2 ± 6.8
19 330 9.7 ± 1.6 6.2 ± 0.7 0.18 ± 0.02 35.8 ± 5.0 1.2 ± 0.7 0.05 ± 0.03 12.1 ± 5.7
20 1722 14.1 ± 2.1 7.7 ± 1.3 0.21 ± 0.04 42.0 ± 8.4 3.6 ± 2.2 0.07 ± 0.05 21.1 ± 13.7
21 265 11.7 ± 2.7 13.8 ± 1.9 0.23 ± 0.01 61.7 ± 8.4 3.4 ± 2.4 0.06 ± 0.02 23.1 ± 11.6
22 498 10.7 ± 2.2 4.5 ± 0.6 0.16 ± 0.03 32.9 ± 7.9 2.1 ± 0.8 0.08 ± 0.03 22.7 ± 7.3
23 559 3.3 ± 2.2 3.5 ± 0.5 0.21 ± 0.03 18.5 ± 3.8 1.2 ± 0.5 0.07 ± 0.04 10.3 ± 3.9
24 347 2.7 ± 2.3 6.2 ± 0.8 0.22 ± 0.01 27.7 ± 3.6 1.0 ± 0.8 0.03 ± 0.02 6.3 ± 4.3
25 2957 9.1 ± 2.4 4.3 ± 0.7 0.16 ± 0.03 28.4 ± 4.0 1.6 ± 0.9 0.14 ± 0.05 19.1 ± 6.0
26 420 12.9 ± 2.1 9.0 ± 0.6 0.25 ± 0.01 36.2 ± 2.4 1.7 ± 0.9 0.04 ± 0.02 11.1 ± 3.6
27 2782 8.2 ± 2.0 5.8 ± 1.0 0.26 ± 0.02 22.0 ± 3.8 3.3 ± 1.1 0.10 ± 0.03 15.4 ± 4.2
28 791 42.0 ± 4.7 16.9 ± 4.0 0.17 ± 0.03 103.6 ± 22.2 4.1 ± 3.1 0.07 ± 0.04 36.7 ± 23.3
AVG ± STD   11.3 ± 9.4 6.5 ± 4.2 0.20 ± 0.06 34.6 ± 18.3 2.2 ± 1.5 0.08 ± 0.04 16.9 ± 9.1
SUM 24,359        
  1. MWA: Mean Wave Amplitude. MWRT: Mean Wave Rise Time, MWRTC: Mean Wave Rise Time Coefficient.