| Value | Category | 
|---|---|
| 00 | Single birth | 
| 10 | Twin or multiple | 
| 11 | 1st of multiple births | 
| 12 | 2nd of multiple births | 
| 13 | 3rd of multiple births | 
| 14 | 4th of multiple births | 
| 15 | 5th of multiple births | 
| 16 | 6th of multiple births | 
| 99 | NIU (not in universe) | 
| var_concept.title | Vocabulary | 
|---|---|
| General maternal and infant health Variables -- TOPICS | IPUMS |