In the WID data structure, age codes starting with (such as 992, 990, or 999) generally represent aggregate or total population groups , rather than specific 5-year or 10-year age brackets.
age_group = "adult_992" for special handling.
Could you clarify what system or dataset this code comes from? That would help give a precise feature engineering suggestion.
Accurate reporting under Code 992 helps the government determine the total volume of adult participants requiring assistance.
If you are using the WID API or the online database interface, you will need to construct your query to filter by this age code.