| Value | Category | Cases | |
|---|---|---|---|
| -3 | Not applicable; Mother unknown | 173 |
14.5%
|
| -2 | No answer | 3 |
0.3%
|
| -1 | Dont know | 104 |
8.7%
|
| 1 | Lower | 608 |
51.1%
|
| 2 | Middle | 182 |
15.3%
|
| 3 | Higher | 120 |
10.1%
|