| Value | Category |
|---|---|
| 0 | No flag |
| 1 | N > interval since birth |
| 2 | N + amen. > interval |
| 3 | N, but period not returned |
| 4 | 95, but no birth |
| 5 | 95, but period returned |
| 6 | 96, but period returned |
| 7 | N, last period during pregnancy |
| 8 | 96, had children |
| 9 | N, period before last birth |