| Value | Category | 
|---|---|
| 00 | Month, year and day | 
| 10 | Month and year | 
| 20 | Month and age (year imputed) | 
| 30 | Year and age | 
| 31 | Year and age (month imputed) | 
| 32 | Year and age (year ignored) | 
| 40 | Year (age/month imputed) | 
| 50 | Age (year/month imputed) | 
| 60 | Month (age/year imputed) | 
| 70 | None (all imputed) | 
| 99 | NIU (not in universe) | 
| var_concept.title | Vocabulary | 
|---|---|
| Female biometrics, general Variables -- TOPICS | IPUMS |