Benzene exposure has been causally linked with acute myeloid leukemia (AML), but inconsistently associated with other hematopoietic, lymphoproliferative and related disorders (HLD) or solid tumors in humans. Many neoplasms have been described in experimental animals exposed to benzene. The Study used Poisson regression to estimate association and the likelihood statistical to derive confidence intervals for cause-specific mortality and HLD cases in 73,789 benzene-exposed compared with 34,504 unexposed workers in the study in 12 cities in China. Follow-up and outcome assessment was based on factory, medical and other records. Benzene-exposed workers experienced increased risks for all-cause mortality

  • What is this study design?
  • What is the comparison group?
  • What is the difference between Retrospective and prospective cohort?

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