| Value | Category | Cases | |
|---|---|---|---|
| 1 | No | 278 |
7.7%
|
| 2 | Once | 495 |
13.6%
|
| 3 | Few times | 1522 |
41.9%
|
| 4 | Many times | 1337 |
36.8%
|
| Sysmiss | 16368 |