| Valeur | Catégorie | le cas | |
|---|---|---|---|
| 1 | no difficulty | 50485 |
82.2%
|
| 2 | some difficulty | 8445 |
13.8%
|
| 3 | a lot of difficulty | 1953 |
3.2%
|
| 4 | cannot do at all | 437 |
0.7%
|
| 8 | don't know | 64 |
0.1%
|
| Sysmiss | 12412 |