Table 3.

Correlation analysis between the chemical elements and oxidative stress biomarker levels in the blood of chronic fluorosis children and healthy children from the non-fluorosis areas

Relations	Spearman’s correlation coefficients, r	t(N-2)	p level
Non-fluorosis children
S vs. Br	− 0.638	− 2.992	0.010
S vs. Hg	− 0.584	− 2.592	0.022
S vs. TBARS	0.581	2.472	0.029
K vs. Cr	− 0.659	− 3.160	0.008
K vs. Pb	0.556	2.316	0.039
Ni vs. Cu	− 0.612	− 2.788	0.015
Ni vs. Mn	− 0.565	− 2.467	0.028
Cr vs. Mn	0.533	2.268	0.041
Sr vs. Hg	0.593	2.652	0.020
Chronic fluorosis–affected children
S vs. Cu	0.761	5.862	0.000
S vs. Zn	0.732	5.378	0.000
S vs. Se	0.478	2.718	0.012
Cl vs. K	0.382	2.065	0.049
K vs. Zn	− 0.564	− 3.413	0.002
Cu vs. Zn	0.701	4.909	0.000
Zn vs. Br	0.459	2.586	0.016
Zn vs. Se	0.626	4.015	0.000
Br vs. Se	0.394	2.144	0.042
Br vs. AHP	0.415	2.279	0.031