| Value |
Category |
| -999 |
rta |
| -888 |
dk |
| -777 |
mv |
| -666 |
Skip |
| -555 |
Other |
| -222 |
na |
| 0 |
never |
| 1 |
1-4 times month |
| 2 |
5-9 times /month |
| 3 |
10 times or more /month |
| 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.