Comparative Screening Analytic Methods for Elderly of Blood Methylmercury Concentration between Two Analytical Institutions

Table 3

Mean difference of mercury mean concentration and methylmercury/total mercury ratio between D Lab and N Lab.

Categories	Total (n-47)	Male (n=30)	Female (n=17)
Total mercury (g/kg)	-0.01 [-0.14, 0.12]	-0.04 [-0.19, 0.11]	0.05 [0.21, 0.30]
p-value	0.898	0.600	0.699
Methyl mercury (g/kg)	0.96 [0.69, 1.34]	1.04 [0.48, 1.61]	0.86 [0.18, 1.54]
p-value	<0.001	<0.001	0.017
Methyl/total ratio ()	6.5 [4.4, 8.6]	7.2 [5.6, 9.1]	5.2 [ 3.8, 8.1]
p-value	<0.001	<0.001	0.013

: differences were calculated by N Lab results minus D Lab results, arithmetic mean [95% confidence intervals].
p-values were calculated by one-sample mean comparison test (mean = 0) for difference between D Lab and N Lab.