| Value | Category | Cases | |
|---|---|---|---|
| 1 | Never | 1877 |
94.4%
|
| 2 | Once | 44 |
2.2%
|
| 3 | Twice | 21 |
1.1%
|
| 4 | 3-5 times | 15 |
0.8%
|
| 5 | 6-10 times | 7 |
0.4%
|
| 6 | 11-20 times | 6 |
0.3%
|
| 7 | More than 20 times | 15 |
0.8%
|
| Sysmiss | 3 |