| Value |
Category |
| -9 |
don't know |
| -8 |
refusal |
| 1 |
they are continually reviewed |
| 2 |
they are periodically reviewed |
| 3 |
they are rarely reviewed |
| 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.