Fig. 1From: An updated re-analysis of the mortality risk from nasopharyngeal cancer in the National Cancer Institute formaldehyde worker cohort study a RRs and 95Â % CIs by Highest Peak Formaldehyde Exposure, Exact Estimation, (from Additional file 1: Table S1a). b RRs and 95Â % CIs by Average Intensity of Formaldehyde Exposure, Exact Estimation, (from Additional file 1: Table S1b)Back to article page