| Value |
Category |
| 1 |
Monthly or more often |
| 2 |
Every 2-3 months |
| 3 |
Every 4-6 months |
| 4 |
Less often than every 6 months |
| 8 |
Don't know |
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.