Value |
Category |
1 |
Every day |
2 |
Very often (5-6 times) |
3 |
Some days (1-4 nights) |
4 |
Not used at all |
5 |
Never used |
99 |
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.