| Value | Category | Cases | |
|---|---|---|---|
| 1 | DAILY | 16 |
2.8%
|
| 2 | LESS THAN DAILY | 12 |
2.1%
|
| 3 | NOT AT ALL | 540 |
94.7%
|
| 9 | REFUSED | 2 |
0.4%
|
| Sysmiss | 3777 |