| Value | Category | Cases | |
|---|---|---|---|
| 1 | Daily | 55 |
4.5%
|
| 2 | Occasionally | 184 |
15.2%
|
| 3 | Not at all | 969 |
80.1%
|
| 9 | 1 |
0.1%
|
|
| Sysmiss | 7189 |