| Value | Category | Cases | |
|---|---|---|---|
| 1 | 1. No difficulty | 3502187 |
80.7%
|
| 2 | 2. Some difficulty | 73353 |
1.7%
|
| 3 | 3. A lot of difficulty | 23523 |
0.5%
|
| 4 | 4. Cannot do at all | 93514 |
2.2%
|
| 5 | 5. Do not know | 19510 |
0.4%
|
| 6 | 6. Cannot yet be determined | 457164 |
10.5%
|
| 9 | 9. Unspecified | 168446 |
3.9%
|
| Sysmiss | 80897 |