| Value | Category | Cases | |
|---|---|---|---|
| 0 | Always | 21 |
0.6%
|
| 1 | Often | 9 |
0.3%
|
| 2 | Sometimes | 20 |
0.6%
|
| 3 | Rarely | 17 |
0.5%
|
| 4 | Never | 3481 |
97.4%
|
| 8 | Refused | 0 |
0%
|
| 9 | Missing | 26 |
0.7%
|
| Sysmiss | 45 |