C H A P T E R 5 PIe = (ax + b) * t + x Where ax + b = αPI tot, x = PI at birth and t = the decimal age, 0 < t ≤ 1 BMIe = (ax + b) * t + x Where ax + b = αBMI tot, x = BMI at the age of 1 year and t = the decimal age, 1 < t ≤ 4 Finally, for each individual the measured PI and BMI were subtracted from the ex-‐ pected PI or BMI at the same age to verify the validity of our model. Results In Figure 2, the linear regression line, based on the total child population, is drawn representing αPI tot = -‐0.6353x + 1.2887, where x is PI at birth. αPI tot Represents the mean change in PI of the population from birth until the age of 1 year. 80 Figure 2: Individual αPI plotted against individual PI at birth (n=372). In the same way all individual αBMI values were plotted against all individual BMI values at the age of 1 year. For BMI the regression line, based on the total child population, revealed to be: αBMI tot = -‐0.1818x + 2.7189, where x = BMI at the age of 1 year.
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