The quiet standing test is used to detect diseases of the postural control system. The descriptive statistics of the center of pressure (COP) of older people during the test tend to be larger than those of healthy young people. but they cannot indicate structural problems in postural control. COP trajectories can be mathematically modeled with structural parameters such as viscosity. https://www.sukrensi.com/flash-sale-Ribavirin-500MG-R0077-500MG-p9633-big-savings/