Statistical significance of differences in ²⁰⁴Pb/²⁰⁶Pb for test substance, diet, blood, urine, and feces in different dose groups (n = 6) of respiratory lead exposure.

<p>Note: Difference are significant when <i>p</i><0.05 level.</p>a, b<p>A significant difference with blood and urine, respectively.</p>c, d, e<p>A significant difference with control group, low dose group and medium dose group, respectively.</p>f, g<p>A significant difference with test substance and diet, respectively.