This page provides reference information for the results of posturography tests performed using CAPS EQ software

**Test Type:** Four letter abbreviation to indicate the test condition (normal or perturbed stability, and eyes open or closed).

**Test Duration:** In seconds Test Status: Such as unable to complete, interrupted or completed.

**ML Sway Centre OX:** The medio-lateral coordinate of the centre of the ellipse with respect to the centre of the force platform. This indicates the average position of the subjects weight with respect to the centre of the force platform; for instance, if the subject tended to put more weight on his or her right or left side.

**AP Sway Centre YO:** the anterior-posterior coordinate of the centre of the ellipse with respect to the centre of the platform. This indicates the average position of the subjects weight with respect to the centre of the platform; for instance if this subject tended to put more weight on his/her heals or toes.

**Max Theor. Sway ML:** is based solely on the subjects height and is calculated according to a standard formula (Bioastronautics Data Book – NASA 1962).

**Max Theor. Sway AP:** is based solely on the subjects height and is calculated according to a standard formula (Bioastronautics Data Book – NASA 1962).

**Max Actual Sway ML: **The actual maximum amount of sway in the medio-lateral direction in the test.

**Max Actual Sway AP: **The actual maximum amount of sway in the anterior/posterior direction during the test.

**95% Conf. Sway ML:** The intersection of the ellipse with the X axis of a cartesian coordinate system parallel to the force platform coordinate system, and with the origin of the centre of the ellipse.

**95% Conf. Sway AP:** The intersection of the ellipse with the Y axis of a cartesian coordinate system parallel to the force platform coordinate system, with the origin in the centre of the ellipse.

**95% Conf. Sway Max:** The major axis of the 95% ellipse.

**95% Conf. Sway Min: **The minor axis of the 95% conf. ellipse.

**Max Actual Sway: **The maximum radial distance (the furthest point actually reached by the subject) measured from the centre of the 95% conf. ellipse (the sway centre).

**Ave Actual Sway:** The average radial distance across all valid points measured from the centre of the 95% conf ellipse (the sway centre).

**Max Sway Velocity: **The maximum speed of the sway centre during the test across all valid points.

**Ave Sway Velocity: **The average speed of the sway centre during the test across all valid points.

**Max Sway Accel:** The maximum acceleration of the sway centre during the test across all valid points.

**Ave Sway Accel:** The average acceleration of the sway centre during the test across all valid points.

**Sway Path Length: **The length of the valid path segments of the sway centre trace.

**Area of the 95% Conf. Ellipse:** The area enclosed in the 95% conf. ellipse. Note that a smaller area does not necessarily mean the subject was not very stable during the test. For example, if the subject swayed back and forth along a segment, the ellipse had a very small area (it could even be 0) because the minor axis is very small, but the major axis could be significant, indicating that the subject is at high risk of a fall in that direction.

**Stability Score:** Indicates the subjects ability to maintain balance during the test (it indicates how much of his/her theoretical limit of stability the subject used at any one time to maintain his/her balance) it is calculated as the compliment to 1, expressed as a percentage, of the maximum value of the ratio between the actual sway and the corresponding theoretical stability in all directions.

**Stability Class: **Classification of the stability score according to the reference values in the same colour as the corresponding stability level.

**Pred. Period of Sway:** The direction in degrees in which the subject swayed the most, with 0 degrees being the medio-lateral direction and 90 degrees being the anterior-posterior direction (the subjects predominate direction of sway is also indicated by the arrow of the major axis of the 95% Conf. Ellipse sway centre display centre).

**Directionality:** The significance of the predominant direction of sway. 0% means the predominant direction of sway is actually not significant, i.e. since the ellipse is a circle, the subject really swayed in all directions equally. On the other hand, 100% percent means the ellipse is a line along which the subject swayed. The values in between 0-100% give the relative importance of the direction of sway.

**Fatigue Ratio:** In percentage, how much larger the sway was in the second half of the test than the first half of the test, which is an indication of how much the subject fatigued in the test conditions (0% means no fatigue). Note a subject will either fatigue or adapt during the test (one of the values will always be shown as 0%, either the fatigue ratio or the the adaptation ratio).

**Adaptation Ratio: **In percentage, how much smaller the sway was in the second half of the test than in the first half, which is an indication of how much the subject was able to adapt to the test conditions (0% means no adaptation). Note a subject will either fatigue or adapt during the test (one of the values will always be shown as 0%, either the fatigue ratio or the adaptation ratio).[/vc_column_text][medic_sep type=”2″ title=”Numerical Results for Weight/BMI”][vc_column_text]**Weight: **The subjects weight as measured during the test and calculated as the average amount of vertical force applied to the force platform.

**BMI:** The Body Mass Index calculated using the height and weight of the subject.

**BMI Class:** The classification of the BMI according to the age and sex based CDC normative data.[/vc_column_text][/vc_column][/vc_row]