Major type of equipment operated by heavy equipment operators in the construction industry and occurrence of lung cancer
| Type of equipment | No. of subjects | Observed/expected |
|---|---|---|
| The referent group for the expected number cases is the general population. | ||
| Paving machine | 1125 | 6/6.9 |
| Earth movers | 1017 | 3/8.6 |
| Dumper | 881 | 0/2.2 |
| Excavator | 4754 | 15/24.6 |
| Tractor | 2185 | 12/12.8 |
| Loading machine | 1727 | 7/6.2 |
| Sweeper | 12 | 0/0.1 |
| Road grader | 939 | 7/11.8 |
| Roller | 950 | 4/4.8 |
| Others (e.g. dredger) or operation of more than one machine | 572 | 7/2.8 |