Value |
Category |
-99 |
Less than one month |
-5 |
Other |
-4 |
Missing data |
-3 |
Refused to answer |
-2 |
Not applicable |
-1 |
Don't know |
0 |
None |
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.