An apparatus for determining data pertaining to the heart rate, respiratory rate, and/or blood pressure of a human subject based on pulse waveform analysis is disclosed. The apparatus comprises a control unit and a sensor unit configured for providing pulse wave data representative of a heartbeat of a subject. The control unit is configured for receiving the pulse wave data, and selecting a portion of the pulse wave data indicative of a plurality of heart periods. Based on the portion of the pulse wave data indicative of a plurality of heart periods, the control unit is further configured for determining a blood pressure variability determining a respiratory rate variability and determining a heart rate variability. Based on at least two of the blood pressure variability, the respiratory rate variability, and the heart rate variability, a correlation value may be determined from which a medical condition of the subject is determined.
