Lead, Arsenic, and Cadmium Contamination and Its Impact on Children's Health in La Oroya, Peru

Table 1

Summary statistics for Pb, As, and Cd by site. The La Oroya Antigua results exclude one soil outlier measured immediately downwind from the metallurgical complex (see text for discussion). Confidence intervals are shown at the 95% level (95% C. I.).

Site	Statistic	Soil			Indoor dust			Drinking water
		Pb (ppm)	Cd (ppm)	As (ppm)	Pb (ppm)	Cd (ppm)	As (ppm)	Pb (ppb)	Cd (ppb)	As (ppb)
La Oroya; Antigua; 𝑛=7, soil; 𝑛=6, dust; 𝑛=5, water	Arithmetic Mean	5,070	257	2,600	4,621	94	1,405	0.42	0.06	8.98
	Geometric Mean	3,138	137	1,844	3,413	45	1,109	0.28	0.05	8.90
	Median	3,177	127	1,658	2,574	28	1,071	0.31	0.06	8.49
	Range	11,154	583	4,820	12,484	335	3,313	0.90	0.07	3.61
	95% C. I.	8,518	466	3,906	9,771	262	2,330	0.76	0.05	2.83
Santa Rosa de Sacco; 𝑛=10, soil; 𝑛=6, dust; 𝑛=5, water	Arithmetic Mean	1,432	29	534	985	20	402	0.40	0.04	1.26
	Geometric Mean	1,211	0	458	883	17	348	0.11	0.00	1.15
	Median	1,152	23	442	813	18	317	0.09	0.00	1.16
	Range	3,446	92	1,021	1,280	33	696	1.54	0.22	1.66
	95% C. I.	1,998	54	640	1,010	24	514	1.31	0.20	1.21
Paccha; 𝑛=7, soil; 𝑛=6, dust; 𝑛=5, water	Arithmetic Mean	596	11	335	575	7	223	0.29	0.03	1.54
	Geometric Mean	356	0	269	512	0	219	0.00	0.00	1.51
	Median	613	18	275	457	4	231	0.06	0.00	1.63
	Range	1,538	21	564	975	24	109	1.22	0.13	0.76
	95% C. I.	1,116	20	484	730	18	84	1.05	0.11	0.60
Huayhuay; 𝑛=8, soil; 𝑛=7, dust; 𝑛=5, water	Arithmetic Mean	452	4	287	1,026	14	371	0.41	0.01	0.73
	Geometric Mean	199	0	271	782	13	340	0.23	0.00	0.73
	Median	186	4	269	587	15	324	0.20	0.00	0.72
	Range	2,272	9	324	2,013	13	425	1.28	0.04	0.16
	95% C. I.	1,524	6	220	1,534	10	314	1.07	0.03	0.12
Yauli; 𝑛=13, soil; 𝑛=7, dust; 𝑛=5, water	Arithmetic Mean	1,900	23	474	2,163	16	343	0.38	0.00	11.43
	Geometric Mean	1,111	13	352	1,811	14	334	0.34	0.00	11.43
	Median	1,623	18	298	2,228	15	303	0.34	0.00	11.38
	Range	7,980	98	1,799	3,635	28	239	0.57	0.00	0.46
	95% C. I.	4,092	54	1,004	2,698	18	174	0.44	0.00	0.18