| Value |
Category |
| -999 |
No response |
| -888 |
Do not know |
| 1 |
Weekly |
| 2 |
Monthly |
| 3 |
Quarterly |
| 4 |
Annually |
| 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.