| Value | Category | Cases | |
|---|---|---|---|
| 1 | 6 years old or younger | 36765 |
12.4%
|
| 2 | 7-9 years old | 113587 |
38.3%
|
| 3 | 10-12 years old | 105825 |
35.7%
|
| 4 | 13 years old or older | 38130 |
12.9%
|
| 5 | Never | 1998 |
0.7%
|
| 7 | N/A | 173656 | |
| 8 | Invalid | 586 | |
| 9 | Missing | 14943 |