| Value |
Category |
| 1 |
Every month |
| 2 |
Some months but not every month |
| 3 |
Only 1 or 2 months |
| 4 |
|
| 5 |
|
| 77 |
|
| 88 |
|
| Sysmiss |
|
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.