Table 5.

Correlation coefficients (r) of the concentration of each heavy metal in serum and urine.

Variables	S-Pb (μg/L)	(n = 30) S-Hg (μg/L)	S-As (μg/L)	S-Cd (μg/L)	U-Pb (μg/L)	U-Hg (μg/L)	U-As (μg/L)	U-Cd (μg/L)
S-Pb (μg/L)	–
(n = 30)S-Hg (μg/L)	r = 0.204 P = .278	–
S-As (μg/L)	r = 0.081 P = .655	r = 0.610 P  < .001	–
S-Cd (μg/L)	r  = 0.673 P  < .001	r  = 0.510 P  = .004	r = 0.153 P = .395	–
U-Pb (μg/L)	r  = 0.679 P  < .001	r = 0.313 P = .093	r = 0.342 P = .051	r  = 0.486 P  = .006	–
U-Hg (μg/L)	r = 0.233 P = .193	r  = 0.384 P  = .036	r  = 0.345 P  = .050	r = 0.140 P = .437	r  = 0.456 P  = .008	–
U-As (μg/L)	r = 0.147 P = .413	r = 0.295 P = .114	r  = 0.762 P  < .001	r = 0.009 P = .962	r  = 0.483 P  = .004	r  = 0.345 P  = .050	–
U-Cd (μg/L)	r  = 0.394 P  = .023	r  = 0.406 P  = .026	r = 0.256 P = .150	r  = 0.479 P  = .005	r  = 0.635 P  < .001	r  = 0.521 P  = .002	r = 0.243 P = .173	–

Correlation coefficients and P-values were estimated using Spearman rank correlation coefficient.

The significance of bold values is a P-value of <.05.