Table 1.

Levels of particular trace elements in children’s hair (mg·kg^− 1)

		Case group/n = 30	Control group n = 30	p
Ca	M ± SD	254.7 ± 91.96	312.8 ± 86.89	p = 0.002
	Median	219.6	290.8
	Range	149.5–458.1	146.1–543.7
As	M ± SD	0.216 ± 0.09	0.061 ± 0.03	p < 0.001
	Median	0.196	0.058
	Range	0.051–0.499	0.004–0.133
Pb	M ± SD	6.028 ± 0.69	3.415 ± 1.207	p < 0.001
	Median	5.793	3.822
	Range	5.178–7.618	0.500–4.490

Mann-Whitney U test was used; p < 0.05 (statistically significant)

M mean, SD standard deviation