| Value | Category | Cases | |
|---|---|---|---|
| 1 | Never | 3595 |
81.4%
|
| 2 | Once | 161 |
3.6%
|
| 3 | Twice | 118 |
2.7%
|
| 4 | 3-5 times | 151 |
3.4%
|
| 5 | 6-10 times | 91 |
2.1%
|
| 6 | 11-20 times | 57 |
1.3%
|
| 7 | More than 20 times | 74 |
1.7%
|
| 8 | Not applicable | 165 |
3.7%
|
| Sysmiss | 5 |