| Value | Category | Cases | |
|---|---|---|---|
| 1 | Below 6 | 0 |
0%
|
| 2 | 6 years old | 9 |
2.4%
|
| 3 | 7 years old | 91 |
24.7%
|
| 4 | 8 years old | 159 |
43.1%
|
| 5 | 9 years old | 66 |
17.9%
|
| 6 | 10 years old | 44 |
11.9%
|
| Sysmiss | 135 |