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Table 1 Summary of the terms related to normal pressure hydrocephalus (NPH) and the different groups described in the paper

From: Diabetes is associated with familial idiopathic normal pressure hydrocephalus: a case–control comparison with family members

Idiopathic normal pressure hydrocephalus (iNPH) The idiopathic form of NPH in general (includes both familial and sporadic subgroups)
Familial idiopathic normal pressure hydrocephalus (fNPH) The familial form of iNPH. An iNPH patient was referred to as a fNPH patient if there were multiple iNPH (fNPH) cases in the family (the precise criteria are described in “Methods” section)
Sporadic idiopathic normal pressure hydrocephalus An iNPH patient does not have any relatives with iNPH
Secondary normal pressure hydrocephalus (sNPH) NPH caused by a known (acquired) cause, e.g. subarachnoid hemorrhage, brain tumor, traumatic brain injury etc.
Non-iNPH relatives In this paper, the probable fNPH patients’ ≥ 60-year-old relatives that had no iNPH (fNPH)