Table 4 Statistical characteristics and trace elements concentration in the total teeth.

From: Aging and trace elements in human coronal tooth dentine

Trace elements

Regression equation

R2

P

Toxic

Sn

y = 38.544 + 2.276*x

0.024

0.059

Pb

y = 29.944 + 1.872*x

0.639

0.000

Li

y = 39.682 + 2.073*x

0.025

0.055

Essential

Sr

y = 32.734 + 0.058*x

0.073

0.001

Mg

y = 10.111 + 4.538*x

0.092

0.000

S

y = 39.156 + 1.673*x

0.022

0.071

K

y = 17.123 + 0.085*x

0.223

0.000

Zn

y = 41.472–0.013*x

0.001

0.729

Ba

y = 39.737 + 0.019*x

0.060

0.003

B

y = 39.449 + 0.212*x

0.059

0.003

  1. R2, coefficient of determination. P, p-value. “y” represented the tooth age, “x” each trace element analyzed. *All teeth in the age range of 18 to 88 years are included. P-values marked in bold are statistically significant (P < 0.05).
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