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Mean scores, adjusted for covariates and sampling strata, on the SRT for subjects with UHg above and below the median (1.29 [micro]g/g creatinine) were 53.0 and 52.1, respectively.
Specifically, performance on tests of verbal and nonverbal memory, attention and psychomotor speed, and fine motor coordination were not associated with UHg. This sample excluded persons with occupational exposure to mercury; thus, our results should not be generalized to this group.
Exposure levels in our sample were low; mean UHg was 1.7 [micro]g/g creatinine.
Our results (Figure 1) confirm the previously observed linear association between number of amalgams and UHg (Kingman et al.
Unlike our study, where exposure levels were very low, occupational studies of workers in the thermometer and chloralkali industries find associations between UHg level and both neurologic and neuropsychologic deficits (Albers et al.
These data suggest that dose-response relationships may begin at UHg levels found in U.S.
Our biological measure of exposure, UHg, also likely includes some organic mercury exposure.