| Value | Category | Cases | |
|---|---|---|---|
| 1 | I have never used | 1723 |
88.2%
|
| 2 | 7 years old or younger | 57 |
2.9%
|
| 3 | 8 or 9 years old | 21 |
1.1%
|
| 4 | 10 or 11 years old | 51 |
2.6%
|
| 5 | 12 or 13 years old | 36 |
1.8%
|
| 6 | 14 or 15 years old | 39 |
2%
|
| 7 | 16 years old or older | 26 |
1.3%
|
| Sysmiss | 9 |