Systematic Changes in the National Surgical Quality Improvement Program Database Over the Years Can Affect Comorbidity Indices Such as the Modified Frailty Index and Modified Charlson Comorbidity Index for Lumbar Fusion Studies

Spine ◽  
2018 ◽  
Vol 43 (11) ◽  
pp. 798-804 ◽  
Author(s):  
Blake N. Shultz ◽  
Taylor D. Ottesen ◽  
Nathaniel T. Ondeck ◽  
Patawut Bovonratwet ◽  
Ryan P. McLynn ◽  
...  
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