| Value | Category | Cases | |
|---|---|---|---|
| 1 | Yes, more than monthly | 12 |
0.3%
|
| 2 | Yes, monthly | 6 |
0.2%
|
| 3 | Yes, several times but less than monthly | 16 |
0.4%
|
| 4 | Yes, once or twice | 70 |
1.9%
|
| 5 | No | 3547 |
97.2%
|
| Sysmiss | 46 |