| Value |
Category |
| 0 |
never |
| 1 |
once a year |
| 2 |
once a term |
| 3 |
once a month |
| 4 |
once a week |
| 88 |
don't know/no response |
| 99 |
refuse |
| 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.