“…Those studies that are specific to the disabled or aged are often limited in sample size or relate to very specific conditions (e.g. 78 UK women aged 70 and older [13], USA older males [14], 502 lower extremity disabled, 758 aged 65 and older, UK [15], 11 post-polio paraplegics [16], 62 spinal cord injuries, Canada [17], 822 older males and females, The Netherlands [18], 61 post-polio spinal cord injuries, India [19], 203 injuries and deformation of the spine, upper limbs, lower limbs and other, UK [20], 77 systemic deformity, motor organ diseases, Poland [21] and 170 spinal injury, cerebral palsy, muscular dystrophy, Poland [22]). Added to this problem of quality and quantity of data available is its often limited applicability to practical design problems.…”