| 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 |