Table 13. Difference of heavy metals content of the roasted coffee beans in producing areas

	No. of samples	Pb (mg/kg)	Cd (mg/kg)
		Mean ± S.D. (min. – max.)	Mean ± S.D. (min.– max.)
America	2	0.011 ± 0.015 (0.000 – 0.021)	0.009 ± 0.003 (0.007 – 0.011)
Brazil	4	0.029 ± 0.039 (0.000 – 0.083)	0.008 ± 0.009 (0.001 – 0.021)
Colombia	8	0.072 ± 0.075 (0.000 – 0.238)	0.012 ± 0.007 (0.005 – 0.028)
Costa Rica	2	0.045 ± 0.037 (0.018 – 0.071)	0.013 ± 0.008 (0.007 – 0.018)
Ethiopia	8	0.110 ± 0.117 (0.024 – 0.393)	0.004 ± 0.003 (0.001 – 0.011)
Guatemala	4	0.072 ± 0.087 (0.000 – 0.184)	0.015 ± 0.008 (0.006 – 0.026)
Italia	2	0.040 ± 0.057 (0.000 – 0.080)	0.005 ± 0.001 (0.004 – 0.005)
Japan	2	0.081 ± 0.007 (0.076 – 0.086)	0.006 ± 0.000 (0.006 – 0.006)
Kenya	5	0.076 ± 0.038 (0.020 – 0.116)	0.004 ± 0.001 (0.003 – 0.005)
Panama	2	0.000 ± 0.000 (0.000 – 0.000)	0.003 ± 0.001 (0.002 – 0.004)
El Salvador	2	0.056 ± 0.034 (0.032 – 0.080)	0.009 ± 0.004 (0.006 – 0.012)
More than two contries	12	0.086 ± 0.030 (0.004 – 0.121)	0.007 ± 0.003 (0.003 – 0.013)
Others*	2	0.025 ± 0.035 (0.000 – 0.049)	0.008 ± 0.001 (0.007 – 0.008)

Means within a vertical column are not significantly different by one-way ANOVA test (p>0.05).
Others contain Indonesia (1 sample) and Peru (1 sample).