| Value | Category | Cases | |
|---|---|---|---|
| 1 | Never | 1780 |
89.5%
|
| 2 | Once | 31 |
1.6%
|
| 3 | Twice | 33 |
1.7%
|
| 4 | 3-5 times | 51 |
2.6%
|
| 5 | 6-10 times | 23 |
1.2%
|
| 6 | 11-20 times | 16 |
0.8%
|
| 7 | More than 20 times | 51 |
2.6%
|
| Sysmiss | 3 |