| Value | Category | Cases | |
|---|---|---|---|
| 1 | Below 6 | 0 |
0%
|
| 2 | 6 years old | 9 |
2.5%
|
| 3 | 7 years old | 90 |
24.9%
|
| 4 | 8 years old | 158 |
43.6%
|
| 5 | 9 years old | 65 |
18%
|
| 6 | 10 years old | 40 |
11%
|
| Sysmiss | 142 |