| Value | Category |
|---|---|
| 0 | No flag |
| 1 | N > interval since birth |
| 2 | N + abstinence > interval |
| 3 | N, but sex not res. |
| 4 | 96, but no birth |
| 5 | 96, but currently pregnant |
| 6 | 96, but resumed sex |
| 7 | N, last sex before pregnancy |
| 8 | N, inconsistent 4 weeks |
| 9 | N, sex before last birth |