| Value |
Category |
| 1 |
Hour |
| 2 |
Day |
| 3 |
Week |
| 4 |
Month |
| 5 |
Year |
| 6 |
Other |
| 97 |
Refused |
| 98 |
Don't know |
| 99 |
Missing |
| 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.