| Value | Category | Cases | |
|---|---|---|---|
| 1 | Below 6 | 0 |
0%
|
| 2 | 6 years old | 1 |
0.9%
|
| 3 | 7 years old | 20 |
17.5%
|
| 4 | 8 years old | 37 |
32.5%
|
| 5 | 9 years old | 29 |
25.4%
|
| 6 | 10 years old | 27 |
23.7%
|
| Sysmiss | 390 |