| Value | Category | Cases | |
|---|---|---|---|
| -99 | Don't know | 0 |
0%
|
| -96 | Other | 1 |
0.5%
|
| 1 | One time only | 1 |
0.5%
|
| 2 | Once a month | 5 |
2.6%
|
| 3 | Several times a month | 0 |
0%
|
| 4 | Twice a year | 101 |
51.5%
|
| 5 | Ongoing | 88 |
44.9%
|
| Sysmiss | 14 |