| Value | Category | Cases | |
|---|---|---|---|
| 1 | Never | 1851 |
84.6%
|
| 2 | Once | 45 |
2.1%
|
| 3 | Twice | 56 |
2.6%
|
| 4 | 3-5 times | 30 |
1.4%
|
| 5 | 6-10 times | 30 |
1.4%
|
| 6 | 11-20 times | 16 |
0.7%
|
| 7 | More than 20 times | 59 |
2.7%
|
| 8 | Not applicable | 100 |
4.6%
|
| Sysmiss | 1 |