The Normal subject’s mean curve values and the respective Standard Deviation values are very important factors for ADplots. Of course these values are equally important to any of the indexes in the literature that assess the differences from normal values.
Carefull selection of normal subjects and adequate number of subjects must be used to establish reliable and representsative normal values.
It is important to note that normal values vary from laboratory to laboratory, among age group etc. Caution must be taken when comparing indexes using values from different laboratories or when comparing different populations.