| Value | Category | Cases | |
|---|---|---|---|
| 0 | Never | 3099 |
98.4%
|
| 1 | Once | 35 |
1.1%
|
| 2 | More than once | 15 |
0.5%
|
| 3 | Not applicable | 0 |
0%
|
| Sysmiss | 1 |