Table 6

Observed/expected, standardised incidence ratios (SIRs) (95% CIs) for white and black men by period of first employment

Type of malignancy	First employed <1950	First employed ⩾1950
All malignant neoplasms		516/495.61	121/161.24
All malignant neoplasms		1.04 (0.95 to 1.14)	0.75^6-160(0.62 to 0.90)
All lymphohaematopoietic neoplasms^6-151		43/30.78	12/15.78
All lymphohaematopoietic neoplasms^6-151		1.40^6-150 (1.01 to 1.88)	0.76 (0.39 to 1.33)
Hodgkin's disease		2/0.75	2/1.83
Hodgkin's disease		—	—
Non-Hodgkin's lymphoma (SEER)		18/12.52	4/8.11
Non-Hodgkin's lymphoma (SEER)		1.44 (0.85 to 2.27)	0.49 (0.13 to 1.26)
Multiple myeloma		7/4.92	2/1.57
Multiple myeloma		1.42 (0.57 to 2.93)	—
Leukaemia		14/9.42	3/3.75
Leukaemia		1.49 (0.81 to 2.49)	—
ANLL		3/2.90	1/1.32
ANLL		—	—
CML		4/1.40	0/0.81
CML		—	—
ALL		1/0.32	1/0.34
ALL		—	—
CLL		4/3.27	1/0.83
CLL		—	—
Unspecified		2/1.53	0/0.44
Unspecified		—	—

↵6-150 p<0.05;
↵6-160 p<0.01.
↵6-151 Total includes three additional lymphohaematopoietic malignancy cases that are not in the categories of lymphoma, leukaemia, or multiple myeloma (see methods text).