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23%, and elongation in 22.45% of the study participants. LTL declined significantly with age both cross-sectionally and longitudinally. More importantly, the longitudinal decline in LTL was much greater than the cross-sectional decline (- 0.017 (p less then 0.001) versus - 0.002 (p less then 0.001) per year). Furthermore, women had a lower within-subject LTL shortening rate than men (- 0.014 versus - 0.020 per year, p less then 0.001). The within-individual longitudinal decline in LTL was much greater than the inter-individual cross-section