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...Aasian sian sspine pine jjournalournal asian spine j https doi org asj cara e geoghegan et al clinical study validation of neck disability index severity among patients receiving one or two level anterior cervical surgery shruthi mohan conor p lynch elliot d k cha kevin c jacob madhav r patel michael prabhu nisheka n vanjani hanna pawlowski kern singh department orthopaedic rush university medical center chicago il usa design retrospective cohort purpose to evaluate the validity established thresholds for ndi undergoing ante rior discectomy and fusion acdf disc arthroplasty cda overview literature few studies have examined threshold values methods a surgical database was reviewed identify procedures demographics operative characteristics comorbidities visual analog scale vas item short form sf physical mental composite scores pcs mcs were recorded categorized using previously improvement from preop erative at each postoperative timepoint convergent evaluated discriminant evalu ated aga...