A system comprising: processor means to process a subject-specific value of a parameter corresponding to a subject based on beat-to-beat information corresponding to said subject, the processor means comprising means to generate a two-dimensional representation of said beat-to-beat information on a coordinate system including a first axis and a second axis, the processor means comprising means to divide the first axis into a plurality of first axis-intervals and to divide the second axis into a plurality of second axis-intervals, the processor means comprising means to count a number of points in each of the first plurality of axis-intervals and to select from the first plurality of axis-intervals a first selected axis-interval having a counted number of points which is maximal compared to other axis-intervals of the first plurality of axis-intervals, the processor means comprising means to count a number of points in each of the second plurality of axis-intervals and to select from the second plurality of axis-intervals a second selected axis-interval having a counted number of points which is maximal compared to other axis-intervals of the second plurality of axis-intervals, the processor means comprising means to determine a first factor value based on the counted number of points within the first selected axis-interval and to determine a second factor value based on the counted number of points within the second selected axis-interval, the processor means comprising means to calculate the subject-specific value based on a quotient of the first and second factor values, wherein said subject-specific value is configured to be compared to at least one predefined reference value corresponding to at least one medical condition, wherein a relationship between the subject-specific value and the reference value is to represent a risk of said subject to suffer from said medical condition. processor means to process a subject-specific value of a parameter corresponding to a subject based on beat-to-beat information corresponding to said subject, the processor means comprising means to generate a two-dimensional representation of said beat-to-beat information on a coordinate system including a first axis and a second axis, the processor means comprising means to divide the first axis into a plurality of first axis-intervals and to divide the second axis into a plurality of second axis-intervals, the processor means comprising means to count a number of points in each of the first plurality of axis-intervals and to select from the first plurality of axis-intervals a first selected axis-interval having a counted number of points which is maximal compared to other axis-intervals of the first plurality of axis-intervals, the processor means comprising means to count a number of points in each of the second plurality of axis-intervals and to select from the second plurality of axis-intervals a second selected axis-interval having a counted number of points which is maximal compared to other axis-intervals of the second plurality of axis-intervals, the processor means comprising means to determine a first factor value based on the counted number of points within the first selected axis-interval and to determine a second factor value based on the counted number of points within the second selected axis-interval, the processor means comprising means to calculate the subject-specific value based on a quotient of the first and second factor values, wherein said subject-specific value is configured to be compared to at least one predefined reference value corresponding to at least one medical condition, wherein a relationship between the subject-specific value and the reference value is to represent a risk of said subject to suffer from said medical condition.