| Value |
Category |
| 1 |
NO TESTS |
| 2 |
1/YR |
| 3 |
1/TERM |
| 4 |
2-3/TERM |
| 5 |
2-3/MONTH |
| 6 |
1 OR MORE/WK |
| 9 |
omitted |
| 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.