Plasma PP was measured and examined as the natural logarithm (continuous) and dichotomized at the median.

A linear mixed longitudinal model was used to estimate the absolute SF growth using the natural logarithm (lnSF).

For each subject, the number of institutions included within the table is counted and the natural logarithm of this value is calculated.

The interaction between body ln(weight) (ln stands for natural logarithm) and age as well as body height and age are also significant in the model.

Natural logarithm of a number.