of borderline significancep < 0.06
Among males in the 2- to 12-year age groups, the mean concentrations of hexacarboxyl- ( p < 0.01), pentacarboxyl- ( p < 0.001), and copro- ( p < 0.009) porphyrins were significantly higher among AU compared with NT groups based on ANOVA F -test values, whereas the heptacarboxyl porphyrin was more of borderline significance ( p < 0.06).