| Value |
Category |
| 1 |
sharp edges |
| 2 |
old/broken |
| 3 |
debris |
| 4 |
not bolted to ground |
| 5 |
hard landing |
| 6 |
other |
| 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.