| Value |
Category |
| -9 |
Don't know (spontaneous) |
| -8 |
|
| 1 |
One hour or less |
| 2 |
|
| 3 |
|
| 5 |
|
| 6 |
|
| 10 |
|
| 12 |
|
| 15 |
|
| 20 |
|
| 24 |
|
| 40 |
|
| 48 |
|
| 72 |
|
| 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.
