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. Author manuscript; available in PMC: 2018 Nov 1.
Published in final edited form as: Environ Res. 2017 Sep 18;159:422–426. doi: 10.1016/j.envres.2017.08.030

Figure 2. Ratio of mercury exposure-related calls per year, by age of the person motivating the call.

Figure 2

Models were fit as Poisson (Independent) GEE. We included calls related to two high-outlier call volume, mass-exposure events in this analysis for age-related trends because the mass-exposures occurred at schools and therefore that exposure process might be age-related. Only persons with known ages were included in this stratified analysis (we included ages reported within a range if the full range fell within one of our strata); thus 2,313 of the 2,934 exposure-related calls were included. Model 1 adjusts for year (linear) and month (dummy variables). Model 2 further adjusts for the total number of exposure-related calls.