| Value | Category |
|---|---|
| 0 | |
| 1 | First pregnancy |
| 2 | Second pregnancy |
| 3 | Third pregnancy |
| 4 | Fourth pregnancy |
| 5 | Fifth pregnancy |
| 6 | Sixth pregnancy |
| 7 | Seventh pregnancy |
| 8 | Eight pregnancy |
| 9 | Ninth pregnancy |
| 10 | Tenth pregnancy |
| 11 | Eleventh pregnancy |
| 12 | Twelfth pregnancy |
| 13 | Thirteenth pregnancy |
| 14 | Fourteenth pregnancy |
| 15 | Fifteenth pregnancy |