| Value |
Category |
| 0 |
Never |
| 1 |
Every 3 months |
| 2 |
Every 6 months |
| 3 |
Every year |
| 4 |
Every 5 years |
| 5 |
Never |
| 6 |
Other |
Warning: these figures indicate the number of cases found in the data file. They cannot be interpreted as summary statistics of the population of interest.