| Value |
Category |
| 1 |
Last seven days |
| 2 |
During the past month |
| 3 |
Before one month |
| 4 |
Less than a year |
| 5 |
More than a year |
| 6 |
Never |
| 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.