| Value | Category |
|---|---|
| 01 | January |
| 02 | February |
| 03 | March |
| 04 | April |
| 05 | May |
| 06 | June |
| 07 | July |
| 08 | August |
| 09 | September |
| 10 | October |
| 11 | November |
| 12 | December |
| 98 | Unknown |
| 99 | NIU (not in universe) |
| var_concept.title | Vocabulary |
|---|---|
| Fertility and Mortality Variables -- PERSON | IPUMS |