Table 6.

Descriptive statistics of SPIs and NCPIs (mg/kg, N = 1822).

Item	Cr	Pb	Cd	Hg	As	Cu	Zn	Ni	NCPI
Mean	0.321	0.162	0.585	0.948	0.229	0.438	0.508	0.670	0.846
Median	0.290	0.170	0.570	0.670	0.210	0.330	0.510	0.670	0.625
Std.	0.171	0.070	0.338	1.083	0.110	0.302	0.192	0.382	0.740
Min	0.040	0.040	0.100	0.030	0.030	0.050	0.170	0.100	0.150
Max	1.890	1.050	6.100	7.530	0.710	2.500	3.570	7.330	5.490
CV (%)	53.26	43.25	57.77	114.22	47.94	69.12	37.82	56.97	87.42