Apparatus and method of processing a subject-specific value based on beat-to-beat information

A computer-based method comprising:

• processing, by a computing device, a subject-specific value of a parameter corresponding to a subject based on beat-to-beat information corresponding to said subject, the subject-specific value being based on first and second factor values, the first and second factor values being based on a two-dimensional representation of said beat-to-beat information on a coordinate system including a first axis and a second axis, the first factor value being based on points within a first axis-interval of said first axis, and the second factor value being based on points within a second axis-interval of said second axis,
• 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 provide an indication of said subject to suffer from said medical condition.