| Value |
Category |
| 1 |
Not at all |
| 2 |
Weekly |
| 3 |
Monthly |
| 4 |
Quarterly |
| 5 |
Half yearly |
| 6 |
Yearly |
| 7 |
No prescribed calendar |
| 99 |
Other (specify) |
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.