| Value | Category | Cases | |
|---|---|---|---|
| 1 | Never | 236 |
1.3%
|
| 2 | 1-2 times a year | 1645 |
9.3%
|
| 3 | 3-5 times a year | 2634 |
14.9%
|
| 4 | Monthly | 2595 |
14.7%
|
| 5 | More than once a month | 10597 |
59.8%
|
| 7 | N/A | 373 | |
| 8 | Invalid | 21 | |
| 9 | Miss | 540 |