| Value | Category | Cases | |
|---|---|---|---|
| -95 | Refused | 0 |
0%
|
| 0 | Never | 1430 |
71.2%
|
| 1 | Once | 260 |
12.9%
|
| 2 | From time to time | 185 |
9.2%
|
| 3 | Often | 102 |
5.1%
|
| r | 31 |
1.5%
|
|
| Sysmiss | 727 |