Statistical analysis
SPSS 19.0 was used for the statistical analysis. Results wereexpressed as means ± SD. Possible relationships between macronu-trient level and metal BAF (or OBA) were examined by partialcorrelation analysis and quantified by the determination coef-ficient, r. A significance level of p < 0.05 was adopted for allcomparisons. The regressions were quantified by the coefficient ofdetermination, R2. The plots and regression lines were drawn inSigmaPlot for Windows Version 10.0.3