Table 1.

Concentration of Pb in the blood and milk of lactating cows reared near a metal smelting zone (n = 20).

Variable	Mean	SD	CV (%)	Minimum	Maximum
Pb in blood, mg/kg	0.38b	0.041	0.20	0.302	0.453
Pb in milk, mg/kg	0.58a	0.018	0.00	0.540	0.600

^a,bMeans followed by different letters differ significantly (p ≤ 0.01).