Table 8

Observed/expected, standardised incidence ratios (SIRs) (95% CIs) white and black men by duration of employment for latency category of ⩾40 years

Type of malignancy		Latency of ⩾40 y
Type of malignancy		Duration of employment of <20 y	Duration of employment 20–39 y	Duration of employment ⩾40 y	All durations of employment
All malignant neoplasms		0/0.12		377/366.05	89/70.61	466/436.78
All malignant neoplasms		0/0.12		1.03 (0.93 to 1.14)	1.26^8-160 (1.01 to 1.55)	1.07 (0.97 to 1.17)
All lymphohaematopoietic neoplasms^8-151		0/0.01		29/22.81	12/4.37	41/27.19
All lymphohaematopoietic neoplasms^8-151		0/0.01		1.27 (0.85 to 1.83)	2.75^8-150 (1.42 to 4.80)	1.51^8-150 (1.08 to 2.05)
Hodgkin's disease	—	1/0.58	1/0.11	2/0.69
		—	—	—
Non-Hodgkin's lymphoma (SEER)		—		13/10.22	4/1.93	17/12.15
Non-Hodgkin's lymphoma (SEER)		—		1.27 (0.68 to 2.18)	—	1.40 (0.82 to 2.24)
Multiple myeloma		—		4/3.93	3/0.81	7/4.74
Multiple myeloma		—		—	—	1.48 (0.59 to 3.04)
Leukaemia		—		9/7.73	4/1.45	13/9.18
Leukaemia		—		1.16 (0.53 to 2.21)	—	1.42 (0.75 to 2.42)

↵8-150 p<0.05;
↵8-160 p<0.01.
↵8-151 Total includes three cases of lymphohaematopoietic malignancy that are not in the categories of lymphoma, leukaemia, or multiple myeloma (see methods text).