| Value | Category | 
|---|---|
| 1 | Month and year reported | 
| 2 | Month and age reported, year imputed | 
| 3 | Year and age reported, month imputed | 
| 4 | Year reported, age and month imputed | 
| 5 | Age reported, year and month imputed | 
| 6 | Month reported, age and year imputed | 
| 7 | Year and age reported, year ignored | 
| 8 | All values imputed | 
| 9 | NIU (not in universe) | 
| var_concept.title | Vocabulary | 
|---|---|
| Marriage and cohabitation Variables -- TOPICS | IPUMS |