| Value | Category | Cases | |
|---|---|---|---|
| 1 | Never | 2010 |
91.9%
|
| 2 | Once | 87 |
4%
|
| 3 | Twice | 27 |
1.2%
|
| 4 | 3-5 times | 14 |
0.6%
|
| 5 | 6-10 times | 13 |
0.6%
|
| 6 | 11-20 times | 8 |
0.4%
|
| 7 | More than 20 times | 17 |
0.8%
|
| 8 | Not applicable | 11 |
0.5%
|
| Sysmiss | 1 |