| Value |
Category |
| 7 |
Form 1 |
| 8 |
Form 2 |
| 9 |
Form 3 |
| 10 |
Form 4 |
| 11 |
Form 5 |
| 12 |
Form 6 (Lower) |
| 13 |
Form 6 (Upper) |
| 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.