| Value |
Category |
| 1 |
TWICE A MONTH |
| 2 |
ONCE A MONTH |
| 3 |
ONCE IN TWO MONTHS |
| 4 |
ONCE IN THREE MONTHS |
| 5 |
TWICE A YEAR |
| 6 |
ONCE A YEAR |
| 7 |
IRREGULARLY |
| 8 |
NEVER |
| 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.