| Value | Category | Cases | |
|---|---|---|---|
| 1 | 1. No difficulty | 3590346 |
82.8%
|
| 2 | 2. Some difficulty | 356606 |
8.2%
|
| 3 | 3. A lot of difficulty | 58105 |
1.3%
|
| 4 | 4. Cannot do at all | 9626 |
0.2%
|
| 5 | 5. Do not know | 4463 |
0.1%
|
| 6 | 6. Cannot yet be determined | 176679 |
4.1%
|
| 9 | 9. Unspecified | 141872 |
3.3%
|
| Sysmiss | 80897 |