| Value | Category | Cases | |
|---|---|---|---|
| -95 | Refused | 0 |
0%
|
| 0 | Never | 1800 |
89.6%
|
| 1 | Once | 92 |
4.6%
|
| 2 | From time to time | 51 |
2.5%
|
| 3 | Often | 26 |
1.3%
|
| r | 39 |
1.9%
|
|
| Sysmiss | 727 |