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The mean occupational level is 3.1.
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Over 1.5 million workers are exposed to this compound every year [ 1], with historical mean occupational exposure levels of 59 ppm and higher depending on the application [ 2].
The reason is that the quality of the applications are manipulated at the occupational level, which means that without occupational fixed effects the estimate of improved quality may also reflect occupation specific demand.
Thus, using individual-level data has the advantage of added efficiency, relative to an analysis of mean occupational data, which might be more inclined to suffer omitted variable bias.
However, standardized bias reaches a very high level for many variables, especially occupational level, educational levels and wage quartile groups.
In addition, task and wage heterogeneity indexes were calculated and compared at occupational level.
Hence, our findings with respect to occupational level characteristics may not be causal.
The mean occupational tenure was 16.15 years (SD = 8.46).
Information on parental occupational level was derived from questionnaires.
Total cholesterol levels were associated with occupational level among men, and with educational level among women.
Levels of PFOA exposure in this population are markedly above background (median values were 5 times background but included a wide range; mean levels were 15 times background), although still below occupational levels (which often have mean levels 200 times background).
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com