| Value |
Category |
| 1 |
dirt/sand/earth |
| 2 |
wood |
| 3 |
plywood |
| 4 |
concrete |
| 5 |
wood and concrete |
| 6 |
other |
| 9 |
dk/ns |
| 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.