| Value | Category | Cases | |
|---|---|---|---|
| 1 | Poor ventilation | 160 |
6%
|
| 2 | Seat uncomfortable | 761 |
28.7%
|
| 3 | Leaking roof | 130 |
4.9%
|
| 4 | Smoking engines | 95 |
3.6%
|
| 5 | Overloading | 1283 |
48.5%
|
| 6 | 5 |
0.2%
|
|
| 96 | Other | 214 |
8.1%
|
| Sysmiss | 16426 |