Table 2. The effect of washing step on the quantitative analysis of elements in dog’s hairs

	Ca	Cu	Fe	K	Mg	Na	P	Se	Zn
2 steps (μg/g)	712.1	0	0	1,326.5	63.7	2,968	428.7	4.1	46.8
3 steps (μg/g)	627.7	0	0	122.6	62.1	369.1	249.5	2.3	59.3
Difference (%)	−11.8	0	0	−90.8	−2.5	−87.6	−41.8	−43.7	26.6
Correlation	0.7	0	0	0	0.9	0.1	0.7	0.9	0.1
t-test	0.602	0	0	< .000	0.948	< .000	0.004	< .000	< .000

Values are mean.