Value |
Category |
-1 |
Missing |
1 |
Very easy |
2 |
Easy |
3 |
Difficult |
4 |
Very Difficult |
7 |
No contact |
8 |
Refused |
9 |
Don't know |
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.