Table 3

Study of crude oil workers: SMRs for selected causes of death, by duration of employment, 1946–94

Cause of death (ICDA–8)		White men employed <5 y (n=5415) p-y=125958			White men employed 5–9 y (n=4217) p-y=99432			White men employed 10–19 y (n=3438) p-y=80978			White men employed ⩾20 y (n=6518) p-y=128029
Cause of death (ICDA–8)		Observed deaths	SMR		95% CI	Observed deaths		SMR	95% CI		Observed deaths	SMR	95% CI	Observed deaths	SMR	95% CI
All causes	412	71	64 to 78	304	63	56 to 71	718	72	66 to 77	2927	75	72 to 78
All cancers (140–209)	95	76	61 to 93	56	54	41 to 71	175	83	71 to 97	754	87	81 to 93
Digestive system (150–159)	27	93	61 to 135	13	51	27 to 87	42	74	53 to 101	170	73	62 to 85
Oesophagus (150)	4	133	35 to 341	0	0	0 to 150	1	20	0 to 113	13	65	34 to 110
Stomach (151)	3	69	14 to 203	3	71	14 to 208	4	39	10 to 101	27	72	48 to 105
Large intestine (153)	7	67	27 to 140	5	56	18 to 131	15	79	44 to 130	68	79	62 to 100
Pancreas (157)	5	87	28 to 204	4	81	21 to 208	11	102	51 to 183	42	94	68 to 127
Larynx (161)	0	0	0 to 280	0	0	0 to 286	1	35	0 to 198	5	44	14 to 102
Lung (162)	29	68	45 to 98	13	38	20 to 65	62	91	70 to 117	243	85	74 to 96
Skin (172–173)	5	121	39 to 284	4	129	34 to 330	5	104	33 to 243	8	59	25 to 117
Prostate (185)	5	87	28 to 204	3	54	10 to 159	13	91	48 to 156	114	129	107 to 155
Bladder (188)	2	86	9 to 313	2	95	10 to 343	1	17	0 to 99	25	87	56 to 129
Kidney (189)	1	30	0 to 168	1	38	0 to 213	3	55	11 to 162	11	54	27 to 97
Brain and CNS (191–192)	4	76	20 to 196	4	100	26 to 256	10	147	70 to 270	19	108	65 to 168
Lymphatic and haematopoietic (200–209)	8	54	23 to 107	10	86	41 to 159	19	89	53 to 139	79	102	81 to 128
Lymphosarcoma and reticulosarcoma (200)	2	111	12 to 401	0	0	0 to 235	3	83	16 to 243	5	46	15 to 107
Hodgkin's disease (201)	1	50	0 to 278	0	0	0 to 249	0	0	0 to 159	4	97	26 to 248
Leukaemia (204–207)	3	52	10 to 153	3	66	13 to 194	8	94	40 to 185	35	111	77 to 154
Other lymphatic tissue (202, 203, 208)	2	40	4 to 147	7	184	73 to 379	5	75	24 to 176	31	109	74 to 155
Benign neoplasms (210–239)	2	117	13 to 424	1	71	0 to 397	8	296	127 to 583	11	127	63 to 227
Diabetes mellitus (250)	2	24	2 to 88	2	28	3 to 104	5	34	11 to 81	27	47	31 to 68
Arteriosclerotic heart disease (410–413)	96	68	55 to 83	103	77	63 to 93	262	78	69 to 88	1028	73	68 to 77
Vascular lesions of CNS (430–438)	10	49	23 to 91	10	48	23 to 88	43	73	53 to 98	219	78	68 to 89
Non-malignant respiratory disease (460–519)	18	61	36 to 97	21	79	49 to 121	33	53	36 to 74	227	70	61 to 80
Pneumonia (480–486)	6	59	21 to 129	2	21	2 to 78	10	43	20 to 79	82	70	56 to 87
Cirrhosis of liver (571)	8	48	20 to 95	7	51	20 to 106	6	23	8 to 50	17	27	16 to 43
All external causes (800–998)	93	71	58 to 88	35	44	30 to 61	63	61	47 to 79	92	56	45 to 68

p-y =Person years.