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4.8. Sex group

The alphabetic sex code may have the values shown in the first column of this table. Some older banders may use numeric sex codes, shown in the second column.

CodeOld codeMeaning
M4 Male.
F5 Female.
U0 Unknown.
X  Sexing not attempted.

As with the age group, the sex code is followed by up to two how-sexed codes; see Section 4.7, “How-codes”.