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. 2014 Mar 11;472(6):1672–1680. doi: 10.1007/s11999-014-3559-0

Fig. 1.

Fig. 1

The numbers of orthopaedic surgery publications using the NIS and NSQIP per year since 2000 based on a PubMed search of the 41 orthopaedic journals identified by Moverley et al. [12] for the terms “Nationwide Inpatient Sample” or “National Surgical Quality Improvement Program” on November 19, 2013 are shown. Only original research studies were included. In total, there were 72 studies using the NIS and 12 using the NSQIP.