| Value | Category | Cases | |
|---|---|---|---|
| 1 | 1. Never | 1988 |
89.6%
|
| 2 | 2. Once or twice | 111 |
5%
|
| 3 | 3. Several times | 80 |
3.6%
|
| 4 | 4. Often | 40 |
1.8%
|
| Sysmiss | 45132 |