| Value | Category | 
|---|---|
| 10 | No | 
| 20 | Yes, any information source | 
| 21 | Yes, from vac card | 
| 22 | Yes, date on vaccination card | 
| 23 | Yes, from vac card without date | 
| 24 | Yes, from mother's report | 
| 97 | Don't know | 
| 98 | Missing | 
| 99 | NIU (not in universe) | 
| var_concept.title | Vocabulary | 
|---|---|
| Measles vaccinations Variables -- TOPICS | IPUMS |