| Value | Category | Cases | |
|---|---|---|---|
| 1 | No - no difficulty | 36687 |
96.3%
|
| 2 | Yes - some difficulty | 1105 |
2.9%
|
| 3 | Yes - a lot of difficulty | 228 |
0.6%
|
| 4 | Cannot, at all | 81 |
0.2%
|
| Sysmiss | 8769 |