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(PI-LL), and C7 SVA, in which disability occurs based on an ODI greater than 40. However, thresholds do not account for age and ODI has been shown to vary with age. The objective was to determine new thresholds based on age. Methods Multicenter, prospective study of consecutive ASD patients. Inclusion criteria: greater than 18yr, ASD. Patients were stratified into groups: less than 45yrs, 46–64, 65–74, greater than 75. Multivariate linear regressions were conducted for baseline PT, PI-LL, and SVA, with baseline ODI and age. ODI of 40 was used as the threshold