| Value | Category | Cases | |
|---|---|---|---|
| 1 | Never | 4339 |
98.2%
|
| 2 | Once | 48 |
1.1%
|
| 3 | Twice | 7 |
0.2%
|
| 4 | 3-5 times | 7 |
0.2%
|
| 5 | 6-10 times | 1 |
0%
|
| 6 | 11-20 times | 1 |
0%
|
| 7 | More than 20 times | 5 |
0.1%
|
| 8 | Not applicable | 4 |
0.1%
|
| Sysmiss | 5 |