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Table 5 Mean of hair mercury concentration (μg/g) stratified by the median of each neuropsychological test.

From: Low level methylmercury exposure affects neuropsychological function in adults

Tests Median Hair Hg P value*
Fine Motor Speed < 30 4.8  
  ≥ 30 3.6 0.006
Digit Symbol < 20 4.8  
  ≥ 20 3.8 0.03
Logical Memory total < 03 4.6  
  ≥ 03 3.7 0.05
Digit Span backward < 02 4.7  
  ≥ 02 3.6 0.007
Easy Learning < 14 4.7  
  ≥ 14 3.7 0.02
Logical Memory first story < 02 4.9  
  ≥ 02 3.7 0.01
  1. *T-test with p value ≤ 0.05