| Value |
Category |
| -999 |
Don't know |
| -888 |
Refuse to answer |
|
None |
| 1 |
1 |
| 2 |
2 |
| 3 |
3 |
| 4 |
4 |
| 5 |
4 + Booster |
| 11 |
.R |
| 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.