Table 6
Study of crude oil workers: SMRs for lymphohaematopoietic cancer, white men, 1946–94
| Observed | Expected | SMR | 95% CI | |
| Non-Hodgkin's lymphoma | 32 | 45.9 | 69 | 47 to 98 |
| Multiple myeloma | 23 | 18.7 | 122 | 77 to 184 |
| Leukaemia | 49 | 50.3 | 97 | 72 to 129 |
| Acute lymphocytic leukaemia (ALL) | 3 | 2.9 | 104 | 20 to 305 |
| Chronic lymphocytic leukaemia (CLL) | 5 | 9.6 | 52 | 16 to 121 |
| Acute myelogenous leukaemia (AML) | 16 | 8.3 | 192 | 110 to 313 |
| Ever employed as roustabout | 12 | 4.3 | 276 | 142 to 482 |
| Ever employed as pumper | 9 | 3.2 | 280 | 127 to 531 |
| Ever employed in maintenance | 4 | 2.7 | 148 | 39 to 380 |
| Ever employed in pipeline field | 4 | 1.6 | 247 | 66 to 632 |
| First employed <1940 | 11 | 2.9 | 374 | 186 to 670 |
| First employed 1940 to 9 | 2 | 2.6 | 77 | 8 to 280 |
| First employed ⩾1950 | 3 | 2.9 | 105 | 21 to 307 |
| Employed <20 y | 3 | 3.4 | 88 | 17 to 257 |
| Employed ⩾20 y | 13 | 4.9 | 265 | 141 to 453 |
| Chronic myelogenous leukaemia (CML) | 6 | 6.3 | 94 | 34 to 205 |
| Acute unspecified leukaemia (AUL) | 4 | 2.7 | 150 | 40 to 384 |
| Unspecified leukaemia (UL) | 6 | 3.4 | 175 | 64 to 382 |
