| Value | Category | 
|---|---|
| 01 | Month and year reported | 
| 02 | Month and age reported, year imputed | 
| 03 | Year and age reported, month imputed | 
| 05 | Year reported, age and month imputed | 
| 06 | Age reported, year and month imputed | 
| 08 | Month reported, age and year imputed | 
| 09 | Year and age reported, year ignored | 
| 10 | Season and year reported | 
| 11 | All values imputed | 
| 99 | NIU (not in universe) | 
| 12 | All reported, inconsistent | 
| var_concept.title | Vocabulary | 
|---|---|
| Marriage and cohabitation Variables -- TOPICS | IPUMS |