| Value | Category | Cases | |
|---|---|---|---|
| 1 | Never | 4023 |
89.3%
|
| 2 | Once | 106 |
2.4%
|
| 3 | Twice | 82 |
1.8%
|
| 4 | 3-5 times | 65 |
1.4%
|
| 5 | 6-10 times | 53 |
1.2%
|
| 6 | 11-20 times | 34 |
0.8%
|
| 7 | More than 20 times | 98 |
2.2%
|
| 8 | Not applicable | 8 |
0.2%
|
| Sysmiss | 37 |