Table 2:

Correlation coefficients between arsenic and other elements concentrations in human toenails.

Reference	n	Cd	Mn	Pb	Se	Cr	Cu	Hg	Ni	Al	Ba	Co	Mo	U	V
Coelho et al., 2012, Portugal	102	0.431	0.714
Kuiper et al., 2014, Qatar	239	−0.021	−0.057	−0.024	0.036		−0.051				−0.029		−0.080	−0.036
Slotnick et al., 2005, USA	259	0.242	0.298	0.397	0.274	0.407	0.177			0.343		0.226			0.441
Mordukhovich et al., 2012, USA	639	0.390	0.560	0.490				0.090
Burgess et al., 2014, USA	55				−0.547
Wong et al., 2015, USA	25	0.250	0.270	0.270					0.260
Grashow et al.,2014a, USA	48	0.370	0.370	0.490					0.200
Sanders et al., 2014, Vietnam	20	0.590	0.580	0.420		0.070		−0.100

The studies are sorted by country, year, and first author’s name. USA = United States of America.