The gravity of clinical illnesses resultant of surgeries was scaled by the psychophysics methods of magnitude and categories estimations by 20 physicians and 20 nurses. Results showed: 1--the continuum of gravity of clinical illnesses resultant of surgeries has quantitative or prosthetic characteristics and non-qualitative or metathetic characteristics. 2--the variability of the estimations of magnitudes is a linear function of the magnitude of the estimations according to Ekman's law.