| Value | Category | Cases | |
|---|---|---|---|
| 1 | Once a year or less | 13 |
1.8%
|
| 2 | A few times a year | 16 |
2.2%
|
| 3 | About once a month | 64 |
8.9%
|
| 4 | Two or three times a month | 134 |
18.6%
|
| 5 | About once a week or more | 492 |
68.4%
|
| Sysmiss | 171 |