Each participant's height and weight were recorded and body mass index (BMI) was calculated. Balance measurements were made with a stabilometer, BiodexTM Balance System. A dynamic postural stability test was performed in a double-leg standing position with eyes open. Each test included three trials that lasted 20 seconds with a 10-second rest period between them. A mean score was calculated from three trials. Subjects were given a practice trial lasting 20 sec. to familiarize with the test. During the dynamic postural stability test three indices were calculated; (1) anteroposterior stability index (APSI), (2) mediolateral stability index (MLSI), (3) overall stability index (OSI). The OSI indicates the total variation in plate deviation (sway) from the horizontal plane. The APSI and MLSI indicate the deviation of the plate (sway) from the horizontal position in the sagittal and frontal planes, respectively. Since the values obtained during measurements indicate the amount of sway from the horizontal position, lower scores show better balance.