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.