| Value |
Category |
| 1 |
Within the past 30 days |
| 2 |
Within the past 31-90 days |
| 3 |
Within the past 4-6 months |
| 4 |
More than 6 months ago |
| 5 |
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.