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This study was undertaken to compare the agreement of occupational exposure assessment by a panel of occupational hygienists with a job exposure matrix and self-reported exposures in a community-based case-control study. We also investigated the intra-rater reliability and degree of attenuation of the hypothetical odds ratio of the panel in retrospective chemical exposure assessment. A panel of three occupational hygienists was recruited to assess exposure to chemicals for 5620 jobs. The agreement between the panel, a job exposure matrix (FINJEM), and the self-reported exposures was then assessed. A further 172 jobs were resubmitted to the panel to assess intra-rater reliability. The kappa for intra-rater reliability ranged from 0.60-0.71. The agreement between the panel and FINJEM ranged from 0.07 to 0.46 (for similar exposures), and agreement between the panel and among the self-reports ranged …