The classification is phenotypical rather than genotypical, i.e. it does not provide codes for medical or scientific purposes.

Note that "0 Not Known" means that the sex of a PERSON has not been recorded. "9 Not Specified" means indeterminate, i.e. unable to be classified as either male or female.

National Codes:

Note:
This was e-GIF approved for use in NHS England.
e-GIF and the Government Data Standards Catalogue have been archived and are available for reference only.

This attribute is also known by these names:

Context	Alias
plural	PERSON GENDER CODES