Table 4

Multiple survey logistic regression analysis of the association between dry eye symptom prevalence and blood mercury levels using median±10% range (45th, 50th and 55th percentile) mercury values as the cut-off

Cut-off mercury levelDry eye symptom
OR95% CI
Median—10% range1.321(1.055 to 1.653)
Median1.324(1.059 to 1.655)
Median+10% range1.329(1.061 to 1.664)
  • The median—10% range cut-off levels that discriminated between participants with ‘low’ and ‘high’ blood mercury levels were 3.99 and 2.72 µg/L for males and females, respectively.

  • The median cut-off levels that discriminated between participants with ‘low’ and ‘high’ blood mercury levels were 4.26 and 2.89 µg/L for males and females, respectively.

  • The median+10% range cut-off levels that discriminated between participants with ‘low’ and ‘high’ blood mercury levels were 4.61 and 3.10 µg/L for males and females, respectively.