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Table 1 Demographic features of patients.

From: Cerebrospinal fluid markers before and after shunting in patients with secondary and idiopathic normal pressure hydrocephalus

  Secondary NPH (n = 17) Mean (SD), frequency Idiopathic NPH (n = 18) Mean (SD), frequency
Age (years) 65 (10); range 49–79 68 (15.7); range 19–86
Males/Females 12/5 11/7
Duration of symptoms (months) 16 (19); range 2–60 40 (37); range 11–164
Etiology   
   Subarachnoid hemorrhage 9 (53%)  
   Cerebrovascular disorder 4 (23%)  
   Trauma 2 (12%)  
   Other* 2 (12%)  
Cerebrovascular risk factors   
   Hypertension 4 (23%) 5 (28%)
   Cardiovascular disorder 3 (18%) 5 (28%)
   Diabetes 1 (6%) 2 (11%)
  1. Cerebrovascular disorder etiology was considered when there was a temporal relationship between an ischemic or hemorrhagic incident other than subarachnoid hemorrhage and development of NPH symptoms. * Meningioma (n = 1) and Recklinghausen's disease (n = 1). These are the same patients as reported in a previous paper [18].