| Value | Category | Cases | |
|---|---|---|---|
| 1 | No - no difficulty | 37521 |
98.5%
|
| 2 | Yes - some difficulty | 411 |
1.1%
|
| 3 | Yes - a lot of difficulty | 91 |
0.2%
|
| 4 | Cannot, at all | 78 |
0.2%
|
| Sysmiss | 8769 |