| Value | Category | Cases | |
|---|---|---|---|
| 1 | Never | 1533 |
70.1%
|
| 2 | Once | 44 |
2%
|
| 3 | Twice | 28 |
1.3%
|
| 4 | 3-5 times | 31 |
1.4%
|
| 5 | 6-10 times | 14 |
0.6%
|
| 6 | 11-20 times | 8 |
0.4%
|
| 7 | More than 20 times | 26 |
1.2%
|
| 8 | Not applicable | 498 |
22.8%
|
| Sysmiss | 6 |