| Value | Category |
|---|---|
| 1 | Month and year given |
| 5 | Month imputed, year given |
| 6 | Month given, year imputed (date placed) |
| 7 | No information given (date placed) |
| 8 | From calendar |
| 9 | NIU (not in universe) |
| var_concept.title | Vocabulary |
|---|---|
| Sterilization Variables -- TOPICS | IPUMS |