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The classification criteria
8. Physical biology is the criterion used to classify persons into the categories 'male' and 'female'. This criterion is physical rather than genetic to cover the exceptional cases such as sex change operations. In the vast majority of cases the physical and genetic categories are identical.
9. Sex is a flat classification having only one level with the two categories 'Male' and 'Female'.
11. The code structure is simply:
12. If it is necessary to include the category 'Intersex or Indeterminate', it should be allocated the code '3'.
Residual categories and codes
13. Not applicable.
14. The following supplementary code is used to code inadequately described responses and non-responses:
Scope of the variable
15. The variable Sex applies to all persons.
16. The Sex classification is not applicable to any other variable.