Table 2.

Comparison of the mean concentrations of heavy metals detected in hair root samples collected in 2016 and 2018 from the same individuals living in Paragsha.

Metal	Concentration (mg/kg)		Mean difference (mg/kg)	T-test P-value
	2016	2018
Al	18.85	29.02	−10.17	0.01
B	4.48	2.08	2.40	< 0.001
Ba	0.56	1.09	−0.53	< 0.001
Be	0.02	0.00	0.02	< 0.001
Cd	0.04	0.11	−0.08	< 0.001
Co	0.02	0.04	−0.03	0.016
Cr	0.26	0.71	−0.45	< 0.001
Fe	24.09	52.85	−28.76	< 0.001
Mn	1.82	4.93	−3.11	< 0.001
Mo	0.06	0.08	−0.03	0.002
Ni	0.19	1.47	−1.28	< 0.001
Pb	2.89	4.26	−1.37	0.039
Cu	7.99	11.30	−3.31	< 0.001
Sb	0.06	0.12	−0.06	0.002
Se	0.67	0.86	−0.18	< 0.001
Sn	0.12	31.10	−30.98	< 0.001
V	0.03	0.05	−0.02	< 0.001
Zn	129.11	206.85	−77.74	< 0.001

Al aluminium, B boron, Ba barium, Be beryllium, Cd cadmium, Co cobalt, Cr chromium, Fe iron, Mn magnesium, Mo molybdenum, Ni nickel, Pb lead, Cu copper, Sb antimony, Se selenium, Sn tin, V vanadium, Zn zinc.