| Value | Category | 
|---|---|
| 0 | No flag | 
| 1 | N > interval since birth | 
| 2 | N + amen. > interval | 
| 3 | N, but period not returned | 
| 4 | 95, but no pregnancy | 
| 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 pregnancy |