The amount of a sperm protein associated with the nucleus on the X chromosome N3 (human) when measured in cerebrospinal fluid. The trait is level of sperm protein associated with the nucleus on the X chromosome N3 (human) in cerebrospinal fluid (Ontology of Biological Attributes entry OBA_2059170). Also known as: cerebrospinal fluid sperm protein associated with the nucleus on the X chromosome N3 (human) amount.