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Table 1 Comparison of linear, quadratic, and cubic models fit for the association between lumbar CSF-P measurements and OSASWs, BMI, and MABP in the training sample group ( n = 42)

From: Noninvasive intracranial pressure estimation by orbital subarachnoid space measurement: the Beijing Intracranial and Intraocular Pressure (iCOP) study

Input signal

Measurement position

Model

r 2

F

P

OSASW

3 mm behind the globe

Linear

0.70

92.23

<0.0001

Quadratic

0.71

48.57

<0.0001

Cubic

0.74

33.22

<0.0001

9 mm behind the globe

Linear

0.77

126.09

<0.0001

Quadratic

0.78

65.42

<0.0001

Cubic

0.80

46.51

<0.0001

15 mm behind the globe

Linear

0.69

79.93

<0.0001

Quadratic

0.71

43.59

<0.0001

Cubic

0.73

30.67

<0.0001

BMI

 

Linear

0.32

18.93

<0.0001

Quadratic

0.40

13.21

<0.0001

Cubic

0.41

13.68

<0.0001

MABP

 

Linear

0.32

19.19

<0.0001

Quadratic

0.35

10.60

<0.0001

Cubic

0.36

10.80

<0.0001

  1. Multivariate analyses were constructed to assess the associations between lumbar CSF-P measurements and orbital subarachnoid space width, lumbar cerebrospinal fluid pressure, and body mass index, which were significantly associated with CSF-P in univariate analysis.
  2. BMI body mass index, Lumbar CSF-P lumbar cerebrospinal fluid pressure, MABP mean arterial blood pressure, OSASW orbital subarachnoid space width.