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Association between lung cancer risk and length of employment as bricklayers using restricted cubic splines (knots at 10th, 25th, 50th, 75th and 90th percentiles of length of employment, log-transformed), the SYNERGY study, 1985–2010. Note: A/B, occupations known (list A) or suspected (list B) to be associated with lung cancer; CI, confidence interval; OR, odds ratio. Vertical bars close to the horizontal axis indicate lung cancer cases.
