| Value | Category | Cases | |
|---|---|---|---|
| 1 | 5 years old or younger | 92 |
10.6%
|
| 2 | 6 years old | 556 |
63.8%
|
| 3 | 7 years old | 206 |
23.6%
|
| 4 | 8 years old or older | 18 |
2.1%
|
| Sysmiss | 128 |