There was neither a correlation observed between the data from HAA-ELISA and pIgA1 trap ( r2 = 0.09 ) in the IgAN patients ( r2 = 0.005 ) nor was there a linear correlation between Area-IgA and data from HAA-ELISA or the pIgA1 trap ( r2 = 0.005 , 0.03 , respectively ) .