Table 3.

Spearman's correlation coefficient (r) between metal concentration in deciduous teeth and age of children

	r value
Fe	−0.28
Mn	−0.21
Ca	−0.37*
Mg	−0.35*
Cd	−0.50*
Cu	−0.47*
Pb	−0.60*
K	−0.38*
Cr	−0.46*
Cationic equilibrium constant (CEC)	−0.20

*p ≤ 0.05, statistically significant correlations