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Table 2 Distribution characteristics of raw and numerically transformed salivary alpha-amylase values

From: Normative references of heart rate variability and salivary alpha-amylase in a healthy young male population

  Raw sAA Transformed sAA
  (U/mL) Square root
(sqrt [U/mL])
Natural log
(ln[U/mL])
n 430 430 430
Mean 17.48 3.96 2.65
Median 13.00 3.60 2.55
Standard deviation 11.70 1.21 0.57
Coefficient of variation (%) 66.94 30.56 21.51
Skewness 1.79 1.11 0.31
Kurtosis 3.27 1.01 0.16
Fifth percentile 6.50 2.48 1.79
95th percentile 43.75 6.06 3.71