2.3.3 Four Step Square (FSS) Test
This test was used to evaluate the dynamic balance and the ability to change direction while walking step-by-step. Four squares were placed on a flat surface, and the squares were numbered from 1 to 4. The subject stood in the 1st square with both his/her feet flat on the ground. The subject was then asked to walk in the squares to square number 1, 2, 4, and 3 in a clockwise direction and then returning back and beginning again from the square number 3 to 4, 2, and 1. The subject was next asked to move as fast as he/she could, without touching the outer lines and stepping in the squares with both the feet. The test was repeated twice, and the best time was recorded. Scores >15 s indicated impaired balance and the risk of fall.11,13-15