| Value | Category | Cases | |
|---|---|---|---|
| 1 | General purpose | 0 |
0%
|
| 2 | Instruction materials | 1 |
33.3%
|
| 3 | Not specified | 0 |
0%
|
| 4 | Other (specify) | 0 |
0%
|
| 99 | Don't know | 2 |
66.7%
|
| Sysmiss | Skipped | 0 | |
| Sysmiss | 303 |