| Value | Category | Cases | |
|---|---|---|---|
| 1 | Yes, more than monthly | 3 |
0.1%
|
| 2 | Yes, monthly | 6 |
0.2%
|
| 3 | Yes, several times but less than monthly | 17 |
0.5%
|
| 4 | Yes, once or twice | 241 |
6.6%
|
| 5 | No | 3380 |
92.7%
|
| Sysmiss | 148 |