Value |
Category |
1 |
Never |
2 |
Monthly |
3 |
Quarterly |
4 |
Bi-Annually |
5 |
Annually |
6 |
Ad hoc |
7 |
Don't know |
9 |
Missing value |
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.