| Value | Category | Cases | |
|---|---|---|---|
| 1 | Never | 1942 |
88.8%
|
| 2 | Once | 70 |
3.2%
|
| 3 | Twice | 55 |
2.5%
|
| 4 | 3-5 times | 48 |
2.2%
|
| 5 | 6-10 times | 18 |
0.8%
|
| 6 | 11-20 times | 16 |
0.7%
|
| 7 | More than 20 times | 24 |
1.1%
|
| 8 | Not applicable | 9 |
0.4%
|
| Sysmiss | 6 |