| Value | Category | Cases | |
|---|---|---|---|
| 1 | No | 7135 |
97.5%
|
| 2 | Once or twice | 101 |
1.4%
|
| 3 | A few times | 52 |
0.7%
|
| 4 | Many times | 32 |
0.4%
|
| Sysmiss | 540 |