The present invention relates to a method and apparatus for calculating postural deviation values indicative of a skeletal condition risk in a patient including the steps of obtaining position data identifying a position in space of body landmarks of an upper body of a patient while standing relaxed and in normal posture; obtaining weight data of the patient; calculating vertical and horizontal plumb line using the position data; and calculating angle deviation values of body parts of the patient being indicative of a skeletal condition risk with respect to the plumb line position value using the position data.