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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.