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Associations between exposure probability and cumulative hours exposed to carbon tetrachloride and non-Hodgkin’s lymphoma risk, the NCI-SEER study, 1998–2001.
| Exposure probability | Cumulative hours | Cases N |
Controls N |
ORa (95% CI) |
|---|---|---|---|---|
| Unexposed | 829 | 712 | 1.0 | |
| <50% | 300 | 234 | 1.0 (0.8, 1.3) | |
| 50–89% | ≤520 | 6 | 4 | 1.2 (0.3, 4.4) |
| >520 | 7 | 5 | 1.2 (0.4, 3.9) | |
| ≥90% | ≤520 | 11 | 12 | 0.7 (0.3, 1.7) |
| >520 | 27 | 11 | 2.1 (1.0, 4.3) |
adjusted for age, study center, sex, race, and education.
