Table 2.

Distribution of the hair concentrations of the chemical elements in participants (n = 199).

Element (ppb)	% Detection *	Median	Mean	SD	20th Percentile	80th Percentile
Elements verified with CRM
Ag	96.98	0.15	1.46	5.16	0.03	0.9
As	91.96	0.11	0.97	1.86	0.02	1.58
B	90.96	1.19	2.79	4.29	0.25	4.58
Ba	100	0.85	1.32	1.57	0.043	1.92
Be	66.33	0.005	0.014	0.03	<LOQ	0.02
Bi	7.04	<LOQ	0.005	0.03	<LOQ	<LOQ
Ca	96.48	779.19	1018.31	1031.4	423.36	1331.69
Cd	63.32	0.008	0.087	0.33	<LOQ	0.076
Co	6.03	<LOQ	0.049	0.29	<LOQ	0.007
Cr	83.42	0.12	0.27	0.58	0.02	0.38
Cu	98.49	14.2	17.44	13.86	10.49	21.95
Fe	98.99	11.01	30.36	49.75	5.12	37.64
Hg	100	0.33	0.8	1.98	0.13	0.83
Mg	98.49	33.01	63.04	88.54	16.39	89.08
Mn	85.43	0.84	4.59	10.23	0.079	4.76
Na	98.99	127.54	209.25	232.22	69.92	299.32
Pb	98.99	1.48	7.82	35.46	0.53	6.26
Sb	55.28	0.0009	0.03	0.14	<LOQ	0.16
Se	84.92	0.58	0.6	0.59	0.14	0.93
Tl	94.47	0.003	0.029	0.072	<LOQ	0.031
V	75.88	0.053	0.075	0.081	<LOQ	0.13
Zn	99.5	214.81	252.55	178.18	161.56	300.45
Elements without verified CRM
Al	92.96	11.22	20.72	25.18	3.6	36.44
Au	56.28	0.0009	0.04	0.33	ND	0.012
Ce	23.62	ND	0.001	0.002	ND	ND
Ga	89.95	0.005	0.008	0.014	0.002	0.009
K	97.99	66.6	101.04	119.73	28.54	145.22
Li	81.41	0.007	0.012	0.022	ND	0.018
Mo	6.03	ND	0.01	0.07	ND	0.015
Ni	76.38	0.1	0.41	2.62	ND	0.33
Rb	46.23	ND	0.047	0.091	ND	0.08
Re	54.27	ND	0.0004	0.0021	ND	ND
Sn	79.9	0.022	0.061	0.18	ND	0.08
Sr	97.49	0.1	2.35	3.74	0.41	3.95
Ti	51.26	0.028	0.058	0.078	ND	0.1
W	41.71	ND	0.014	0.045	ND	0.01

* Percent of the 199 samples with measurement above LOQ; LOQ = limit of quantification; ND = No detection in sample; CRM = certified reference human hair materials.