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. 2018 Sep 18;92(1):101–109. doi: 10.1007/s00420-018-1358-8

Table 2.

Incidence rate ratio (IRR) of cancer in total and by gender

	Person-years at risk (years)	Cancer
	Person-years at risk (years)	Number	IR/10⁵ person-year	Crude IRR	95% CI	Adjusted IRR^a	95% CI
Total
Non-Chinese food chefs	542,658	338	62.3	1.00		1.00
Chinese food chefs	3,640,892	5761	158.3	2.54	2.28–2.84	1.69	1.51–1.89
Female
Non-Chinese food chefs	310,107	216	69.7	1.00		1.00
Chinese food chefs	2,542,241	4413	173.6	2.49	2.17–2.86	1.66	1.45–1.91
Male
Non-Chinese food chefs	232,551	122	52.5	1.00		1.00
Chinese food chefs	1,098,651	1349	122.8	2.34	1.95–2.82	1.73	1.44–2.09

Bold values indicate p < 0.05

CI confidence interval, IR incidence rate, IRR incidence rate ratio

^aAdjusting for age range (15–39, 40–59 and ≥ 60 years old) and gender