Value |
Category |
1 |
at least once per year |
2 |
every 1-2 years |
3 |
every 3-5 years |
4 |
less than every 5 years |
8 |
dk/dr |
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.