| Value | Category | Cases | |
|---|---|---|---|
| 1 | Daily | 3 |
0.1%
|
| 2 | Weekly | 15 |
0.5%
|
| 3 | Monthly | 87 |
3.1%
|
| 4 | Never | 2746 |
96.3%
|
| Sysmiss | 1955 |