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# Table 1 Parameters, distinctive for normal pressure hydrocephalus

Parameter Symbol Value Unit Reference
Elastance $$E$$ 0.23 mL−1 [9, 16]*
Exponential parameter $$p_{1}$$ 4 mmHg [16]*
Offset pressure $$p_{0}$$ 3.2 mmHg [16]*
Rate of CSF formation $$Q_{form}$$ 0.35 mL/min [13]
Total CSF outflow resistance $$R_{abs}^{tot}$$ 20.6 mmHg/(mL/min) [13, 16]*
Relative spinal compliance $$k_{V}$$ 0.35 [17]
Spinal venous pressure $$p_{v}^{s}$$ 5.3 mmHg [4]
Distance between spinal and cranial reference points $$l_{sc}$$ 33.8 cm [4]
Distance between jugular veins and cranial reference point $$l_{jug}$$ 11.0 cm [4]
Density of CSF $$\rho_{CSF}$$ 1000 kg/m3
Density of blood $$\rho_{blood}$$ 1060 kg/m3
Gravitational acceleration $$g$$ 9.81 m/s2
Relative spinal outflow conduction $$k_{R}$$ n/a#
1. * Computed from data given in the referenced work: $$E = \ln \left( {RPPC + 1} \right)/\Delta V_{a}$$ [18], $$p_{1} = ICP_{r} - p_{0} - p_{v}^{s}$$, $$p_{0} = p_{0}^{M} - p_{v}^{s}$$, $$R_{abs}^{tot} = (ICP_{r} - p_{v}^{s} )/Q_{form}$$ [3]
2. # The value of this parameter is unknown. It is estimated in this study