| Value | Category |
|---|---|
| 1 | Daily |
| 2 | 3-4 times a week |
| 3 | 3-4 times per month |
| 4 | 3-4 times a year |
| 5 | Once a year |
| 6 | Twice a year |
| 8 | Once (only once) |
| 9 | Once per 2 years |
| 16 | It depends: both frequently and seldom |
| 17 | Once in 3 years |
| 18 | 6-7 times per year |
| 99 | DO NOT KNOW/NO RESPONSE |
| Sysmiss |