| Value | Category | Cases | |
|---|---|---|---|
| 1 | No, no difficulty | 134902 |
98.8%
|
| 2 | Yes, some difficulty | 1159 |
0.8%
|
| 3 | Yes, a lot of difficulty | 314 |
0.2%
|
| 4 | Cannot learn at all | 151 |
0.1%
|
| 5 | MISSING | 0 |
0%
|
| Sysmiss | 253 |