Fig. 2 From:Cerebrospinal fluid osmolality cannot predict development or surgical outcome of idiopathic normal pressure hydrocephalus Osmolality of lumbar CSF obtained from iNPH patients versus control subjects.aThe 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.bThe osmolality of iNPH patient CSF as a function of the outflow resistance measured during diagnostic workup, n = 25 patients.NSnot significant Back to article page