The amount of a nicotinamide riboside kinase 1 (human) when measured in cerebrospinal fluid. The trait is level of nicotinamide riboside kinase 1 (human) in cerebrospinal fluid (OBA_2081297, an Ontology of Biological Attributes id). Also known as: cerebrospinal fluid nicotinamide riboside kinase 1 (human) amount.