C H A P T E R 6 98 Figure 2: PI is plotted against age (in months). The PIm line, the PIe line and the PIe range are shown. If a child has a PIm value that is above or underneath the area of the PIe range, the child is at risk to develop an abnormal growth. In Table 5 the values of PI expected decrease in time, because of the relative high PI at start. These values show the regression to the mean13. This is the phenomenon that growth is changing for most children, dependent on their starting value. In the prediction model the regression to the mean is taken into account. It has to be mentioned that, if a child has a PIm at the age of 1 year that is aberrant of the PIe at that age, it does not mean that the child is actually over-‐ or underweight or that their actual weight is abnormal. This value only shows that the child tends to have an abnormal growth, according to the individual growth pattern of the child. In other words: These children deviate in positive or negative sense from their expected growth pattern (as shown in Figure 2).
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