A system comprising: processor means for processing a specific subject value of a parameter corresponding to a subject on the basis of beat-to-beat information corresponding to said subject, the processor means comprises means for generating a two-dimensional representation of said beat-to-beat information in a coordinate system that includes a first axis-and a second axis, the processor means comprise means for dividing the first axis into a plurality of first axis intervals and for dividing the second axis into a plurality of second axis intervals, the processor means comprise means for counting several points on each of the first plurality of axis intervals and for selecting from the first plurality of axis intervals a first selected axis interval having a number of points counted which is maximum compared to other axis intervals of the first plurality of axis intervals, means d The processor comprises means for counting several points at each of the second plurality of axis intervals and for selecting from the second plurality of axis intervals a second selected axis interval having a number of counted points that is maximum compared to other intervals. of the axis of the second plurality of axis intervals, the processor means comprise means for determining a first factor value based on the number of points counted within the first selected axis range and for determining a second factor value based on of the number of points counted within the second selected axis range, the processor means comprise means for calculating the specific subject value based on a quotient of the first and second factor values, wherein said specific subject value is configured. to be compared with at least one predefined reference value corresponding to at least one state medical, where a relationship between the specific value of the subject and the reference value is to represent a risk of said subject to suffer said medical condition.Un sistema que comprende: medios de procesador p
