| Value | Category | Cases | |
|---|---|---|---|
| 1 | No - no difficulty | 12448 |
98.4%
|
| 2 | Yes - some difficulty | 119 |
0.9%
|
| 3 | Yes – a lot of difficulty | 59 |
0.5%
|
| 4 | Cannot remember/ concentrate at all | 18 |
0.1%
|
| Sysmiss | 49 |