Table 3.

Age-standardised incidence ratio (SIR) and 95% confidence interval (CI) of cancers according to the different road transportation workers (RTWs).

	Definition of RTWs, SIR (95% CI)
	First 1 year fixed RTWs	First 3 years fixed RTWs	More than 1 year worked as RTWs
Referenced from the government employee
Liver and intrahepatic bile ducts neoplasms	1.23 (1.12–1.36)	1.24 (1.08–1.42)	2.41 (2.23–2.59)
Other digestive organs neoplasms	1.46 (1.18–1.78)	1.58 (1.19–2.06)	2.63 (2.25–3.06)
Trachea, bronchus and lung neoplasms	1.48 (1.33–1.65)	1.47 (1.26–1.70)	2.79 (2.58–3.02)
Bladder neoplasms	1.41 (1.16–1.71)	1.50 (1.15–1.93)	2.55 (2.20–2.93)
Referenced from the whole working population
Liver and intrahepatic bile ducts neoplasms	1.15 (1.04–1.27)	1.14 (0.99–1.30)	1.61 (1.50–1.72)
Other digestive organs neoplasms	1.28 (1.04–1.57)	1.37 (1.03–1.79)	1.79 (1.53–2.08)
Trachea, bronchus and lung neoplasms	1.28 (1.15–1.43)	1.25 (1.07–1.44)	1.80 (1.66–1.95)
Bladder neoplasms	1.26 (1.03–1.52)	1.29 (1.01–1.65)	1.72 (1.49–1.98)

First 1-year fixed RTWs: RTWs who worked in the road transport industry during the first year (2006) of the study.

First 3-year fixed RTWs: RTWs who worked in the road transport industry for the first 3 years (2006–2008) of the study.

More than 1 year as RTWs indicated those who worked 1 year or more in the road transport industry during the study (2006–2015).

RTW road transportation worker.