| Value | Category |
|---|---|
| 1 | Couple having two or less surviving children |
| 2 | Couple having more than two surviving children:all females |
| 3 | Couple having more than two surviving children:all males |
| 4 | Couple having more than two surviving children:one male and others females |
| 5 | Couple having more than two surviving children:one female and others males |
| 6 | Any other combination |
| 7 | Having no surviving child |