biodex BioSway Operation Manual page 69

APPENDIX D
addItIonal noteS about ctSIb report InterpretatIon
The CTSIB result presentation is easy to understand and communicate if you keep the following
points in mind:
1. A description of the relationship of the test condition to the sensory system is provided when
the m-CTSIB protocol format of 4 conditions is used. Space limitations preclude the descrip-
tion for 6 conditions. The 4 condition m-CTSIB test is the preferred test protocol.
2. The results are presented relative to the upper limit of the "normal" reference data. Patient
results will either be better, equal to or worse than normal. The higher the Sway Index score,
the more unstable the patient was for the condition. Total instability, where a patient must
hold onto something or stop, is considered a fall and is noted as "Fell" in the test results.
3. The number at the midpoint of the scale is the upper limit of the normal score, rounded to the
nearest .25. For example:
• Eyes open firm high value is .48. The noted value is .50
• Eyes closed firm high value is .99. The noted value is 1.0
• Eyes open foam high value is .71. The noted value is .75
• Eyes closed foam high value is 2.22. The noted value is 2.25
4. The end point for the RED zone is three times the mid point or, basically, three standard devi-
ations from the mid point.
Figure D1: The m-CTSIB Test Results screen.
— D-1 — APPENDIX D