| Value | Category | Cases | |
|---|---|---|---|
| 1 | Never | 1648 |
75.3%
|
| 2 | Once | 8 |
0.4%
|
| 3 | Twice | 7 |
0.3%
|
| 4 | 3-5 times | 4 |
0.2%
|
| 5 | 6-10 times | 4 |
0.2%
|
| 6 | 11-20 times | 5 |
0.2%
|
| 7 | More than 20 times | 7 |
0.3%
|
| 8 | Not applicable | 499 |
22.8%
|
| Sysmiss | 6 |