Selected toxic and essential heavy metals in impacted teeth and the surrounding mandibular bones of people exposed to heavy metals in the environment

Table 7 Heavy metal concentrations (μg/g) in the samples from people with different levels of education living in Ruda Slaska

	Impacted teeth (n = 34)						Bone surrounding the impacted teeth (n = 34)
	Educational level						Educational level
Element	Primary (n = 6) Median	Vocational (n = 8) Median	Secondary (n = 11) Median	Higher (n = 9) Median	H-value	p - level^*	Primary (n = 6) Median	Vocational (n = 8) Median	Secondary (n = 11) Median	Higher (n = 9) Median	H-value	p - level^*
Pb	14.63	12.41	11.89	11.83	9.88	0.196	7.69	7.22	7.80	8.04	1.171	0.982
Cd	0.12	0.12	0.14	0.11	7.90	0.481	0.64	0.86	1.20	0.91	4.112	0.249
Fe	9.14	9.74	9.94	11.92	7.47	0.098	25.45	18.69	15.32	13.37	7.772	0.873
Mn	3.84	3.84	3.85	3.94	1.58	0.901	3.82	3.42	4.23	3.91	1.653	0.884
Cr	5.09	5.79	4.66	5.79	4.32	0.229	1.34	1.99	4.47	1.45	4.121	0.249
Cu	8.60	9.05	9.84	8.77	1.58	0.664	10.40	10.56	15.08	8.45	1.980	0.577
Zn	356.55	274.80	288.92	321.86	4.65	0.207	136.11	187.74	212.39	210.62	2.691	0.442

n number of samples
^* p-levels, estimated using the ANOVA Kruskal–Wallis test, used to identify statistically significant differences between the metal concentrations in the samples provided by people with different levels of education living in Ruda Slaska

ISSN: 1745-6673