| Value | Category | Cases | |
|---|---|---|---|
| 1 | Never | 4112 |
91.3%
|
| 2 | Once | 52 |
1.2%
|
| 3 | Twice | 54 |
1.2%
|
| 4 | 3-5 times | 71 |
1.6%
|
| 5 | 6-10 times | 56 |
1.2%
|
| 6 | 11-20 times | 28 |
0.6%
|
| 7 | More than 20 times | 83 |
1.8%
|
| 8 | Not applicable | 9 |
0.2%
|
| Sysmiss | 41 |