| Value | Category | Cases | |
|---|---|---|---|
| 1 | Never | 1520 |
8.7%
|
| 2 | 1-2 times a year | 2297 |
13.1%
|
| 3 | 3-5 times a year | 3725 |
21.3%
|
| 4 | Monthly | 3109 |
17.8%
|
| 5 | More than once a month | 6857 |
39.2%
|
| 7 | N/A | 371 | |
| 8 | Invalid | 23 | |
| 9 | Miss | 739 |