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. 2012 Apr 20;31(1):9. doi: 10.1186/1880-6805-31-9

Figure 2.

Figure 2

Histograms of the interindividual variation of salivary alpha-amylase. From left to right, the distributions of raw, square root-, and natural logarithmic-transformed sAA values are presented. The histogram of raw amylase exhibited a markedly skewed distribution. Numerical transformations (square root and natural logarithm) improved skewness, although square root transformation appeared insufficient.