| Value | Category | Cases | |
|---|---|---|---|
| 1 | Daily or almost daily | 4 |
0.1%
|
| 2 | Weekly | 16 |
0.4%
|
| 3 | Monthly | 18 |
0.4%
|
| 4 | Less than monthly | 106 |
2.6%
|
| 5 | Never | 3890 |
96.4%
|
| Sysmiss | 976 |