Glassman, S. D. et al. The impact of positive sagittal balance in adult spinal deformity. Spine (Phila Pa 1976). 30, 2024-2029 (2005).
 Dubousset, J. Three-dimensional analysis of the scoliotic deformity in Pediatric Spine: Principles And Practice (ed. Weinstein, Sl.) (Raven Press, 1994).
 Glassman, S. D., Berven, S., Bridwell, K., Horton, W. & Dimar, J. R. Correlation of radiographic parameters and clinical symptoms in adult scoliosis. Spine (Phila Pa 1976). 15, 682-688 (2005).
 Fon, G., Pitt, M. & Thies, A. Jr. Thoracic kyphosis: range in normal subjects. Am. J. Roentgenol. 134, 979-983 (1980).
 Milne, J. S. & Williamson, J. A longitudinal study of kyphosis in older people. Age Aging. 12, 225-233 (1983).
 Manns, R. A., Haddaway, M. J., McCall, I. W., Cassar Pullicino, V. & Davie, M. W. The relative contribution of disc and vertebral morphometry to the angle of kyphosis in asymptomatic subjects. Clin. Radiol. 51, 258-262 (1996).
 Sinaki, M., Khosla, S., Limburg, P. J., Rogers, J. W. & Murtaugh, P. A. Muscle strength in osteoporotic versus normal women. Osteoporos. Int. 3, 8-12 (1993).
 Sinaki, M., Itoi, E., Rogers, J. W., Bergstralh, E. J. & Wahner, H. W. Correlation of back extensor strength with thoracic kyphosis and lumbar lordosis in estrogen-deficient women. Am. J. Phys. Med. Rehabil. 75, 370-374 (1996).
 Takemitsu, Y., Harada, Y., Iwahara, T., Miyamoto, M. & Miyatake, Y. Lumbar degenerative kyphosis. Clinical, radiological and epidemiological studies. Spine (Phila Pa 1976). 13, 1317-1326 (1988).
 Gelb, D. E., Lenke, L. G., Bridwell, K. H., Blanke, K. & McEnery, K. W. An analysis of sagittal spinal alignment in 100 asymptomatic middle and older aged volunteers. Spine (Phila Pa 1976). 20, 1351-1358 (1995).
 Vialle, R. et al. Radiographic analysis of the sagittal alignment and balance of the spine in asymptomatic subjects. J. Bone Joint Surg. Am. 87, 260-267 (2005).
 Zhu, Z. et al. Sagittal alignment of spine and pelvis in asymptomatic adults: norms in Chinese populations. Spine (Phila Pa 1976). 39, E1-E6 (2013).
 Mac-Thiong, J. M., Roussouly, P., Berthonnaud, E. & Guigui, P. Age- and sex-related variations in sagittal sacropelvic morphology and balance in asymptomatic adults. Eur. Spine J. 20 Suppl 5, 572-577 (2011).
 Lee, C. S., Chung, S. S., Kang, K. C., Park, S. J. & Shin, S. K. Normal patterns of sagittal alignment of the spine in young adults: radiological analysis in a Korean population. Spine (Phila Pa 1976). 36, E1648-E1654 (2011).
 Janssen, M. M., Drevelle, X., Humbert, L., Skalli, W. & Castelein, R. M. Differences in male and female spino-pelvic alignment in asymptomatic young adults: a three-dimensional analysis using upright low-dose digital biplanar X-rays. Spine (Phila Pa 1976). 34, E826-E832 (2009).
 Schwab, F. et al. Gravity line analysis in adult volunteers: age-related correlation with spinal parameters, pelvic parameters, and foot position. Spine (Phila Pa 1976). 31, E959-E967 (2006).
 Roussouly, P. & Nnadi, C. Sagittal plane deformity: an overview of interpretation and management. Eur. Spine J. 19, 1824-1836 (2010).
 Yoshimura, N. et al. Mutual associations among musculoskeletal diseases and metabolic syndrome components: a 3-year follow-up of the ROAD study. Mod. Rheumatol. 25, 438-448 (2015).
 Yoshimura, N. et al. Reference values for hand grip strength, muscle mass, walking time, and one-leg standing time as indices for locomotive syndrome and associated disability: the second survey of the ROAD study. J. Orthop. Sci. 16, 768-777 (2011).
Yoshimura, N. et al. Cohort Profile: Research on Osteoarthritis/Osteoporosis Against Disability Study. Int. J. Epidemiol. 39, 988-995 (2010).
 Nagata, K., Yoshimura, N. & Muraki, S. Prevalence of cervical cord compression and its association with physical performance in a population-based cohort in Japan. Spine. 37, 1892-1898 (2012).
 Schwab, F. et al. Scoliosis Research Society-Schwab Adult Spinal Deformity Classification. Spine (Phila Pa 1976).37, 1077-1082 (2012).