Evaluating the effect of growing patient numbers and changing data elements in the national surgical quality improvement program (NSQIP) database over the years: a study of posterior lumbar fusion outcomes

The use of national databases in spinal surgery outcomes research is increasing. A number of variables collected by the American College of Surgeons National Surgical Quality Improvement Program (NSQIP) changed between 2010 and 2011, coinciding with a rapid increase in the number of patients included per year. However, there has been limited study evaluating the effect that these changes may have on the results of outcomes studies.

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