Fig. 2From: Cerebrospinal fluid osmolality cannot predict development or surgical outcome of idiopathic normal pressure hydrocephalusOsmolality of lumbar CSF obtained from iNPH patients versus control subjects. a The osmolality of lumbar CSF (L-CSF) in control subjects and iNPH patients, n = 20 control subjects and n = 35 iNPH patients. The data were evaluated for statistical significance with the Mann–Whitney test. b The osmolality of iNPH patient CSF as a function of the outflow resistance measured during diagnostic workup, n = 25 patients. NS not significantBack to article page