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. Author manuscript; available in PMC: 2014 Jul 23.
Published in final edited form as: Scand J Work Environ Health. 2010 Sep 13;36(6):499–508. doi: 10.5271/sjweh.3088

Figure 1.

Figure 1

Adjusted mortality rate ratios (MRR) of lung cancer as a function of cumulative exposure to synthetic metalworking fluid (MWF) as estimated by Cox regression using penalized splines in the full cohort and subcohort, the latter of which is restricted to workers hired on or after start of follow-up. Models adjusted for straight and soluble MWF (mg/m3 per year), gender, race, plant, calendar year, and years since retirement. Straight, soluble, and synthetic MWF, calendar year, and years since retirement were treated as non-linear terms if Akaike information criterion (AIC) selected degrees of freedom >1.0 and P<0.10. Rug plots represent the distribution of exposure for subcohort (top) and the full cohort (bottom).