Definition
FERTPREFMN (MV602) reports responses to the question, "Would you like to have a (another) child or would you prefer not to have any (more) children"? The standard response categories are "have another," "no more/none," "undecided," and various categories related to not being at risk of having more children (such as sterilization, infecundity, and not having a partner).
In IPUMS-DHS, all responses in the general category of "not at risk of having more children" share a common first digit of 4, while the second digit distinguishes between the specific reasons (for example, code "41" for "Sterilized [respondent or partners]").