Calculating risks: the power and pitfalls of registry data

Schoenfeld, 2011, Risk factors for immediate postoperative complications and mortality following spine surgery: a study of 3475 patients from the National Surgical Quality Improvement Program, J Bone Joint Surg Am, 93, 1577, 10.2106/JBJS.J.01048

Wang, 2011, Utility of a combined current procedural terminology and International Classification of Diseases, Ninth Revision, Clinical Modification code algorithm in classifying cervical spine surgery for degenerative changes, Spine, 36, 1843, 10.1097/BRS.0b013e3181f7a943

Wang, 2007, Complications and mortality associated with cervical spine surgery for degenerative disease in the United States, Spine, 32, 342, 10.1097/01.brs.0000254120.25411.ae

Deyo, 2010, Trends, major medical complications, and charges associated with surgery for lumbar spinal stenosis in older adults, JAMA, 303, 1259, 10.1001/jama.2010.338

Pumberger, 2012, Perioperative mortality after lumbar spinal fusion surgery: an analysis of epidemiology and risk factors, Eur Spine J, 21, 1633, 10.1007/s00586-012-2298-8

Yadla, 2010, Early complications in spine surgery and relation to preoperative diagnosis: a single-center prospective study, J Neurosurg Spine, 13, 360, 10.3171/2010.3.SPINE09806

Rampersaud, 2010, Spine adverse events severity system: content validation and interobserver reliability assessment, Spine, 35, 790, 10.1097/BRS.0b013e3181bf25a3

Owens, 1978, ASA physical status classifications: a study of consistency of ratings, Anesthesiology, 49, 239, 10.1097/00000542-197810000-00003

de Jong, 1993, Medical risk classification of dental patients in The Netherlands, J Public Health Dent, 53, 219, 10.1111/j.1752-7325.1993.tb02707.x

Mirza, 2008, Development of an index to characterize the “invasiveness” of spine surgery: validation by comparison to blood loss and operative time, Spine, 33, 2651, 10.1097/BRS.0b013e31818dad07

Hutter, 2006, Identification of surgical complications and deaths: an assessment of the traditional surgical morbidity and mortality conference compared with the American College of Surgeons-National Surgical Quality Improvement Program, J Am Coll Surg, 203, 618, 10.1016/j.jamcollsurg.2006.07.010

Hall, 2009, Does surgical quality improve in the American College of Surgeons National Surgical Quality Improvement Program: an evaluation of all participating hospitals, Ann Surg, 250, 363, 10.1097/SLA.0b013e3181b4148f

Health Forum, LLC. Fast Facts on US Hospitals. 2013. Available at: http://www.aha.org/research/rc/stat-studies/fast-facts.shtml. Accessed March 29, 2013.

Davenport, 2009, Assessing surgical quality using administrative and clinical data sets: a direct comparison of the University Health System Consortium Clinical Database and the National Surgical Quality Improvement Program data set, Am J Med Qual, 24, 395, 10.1177/1062860609339936

Ioannidis, 2013, Are mortality differences detected by administrative data reliable and actionable?, JAMA, 309, 1410, 10.1001/jama.2013.3150

McGirt, 2013, The National Neurosurgery Quality and Outcomes Database (N2QOD): general overview and pilot-year project description, Neurosurg Focus, 34, E6, 10.3171/2012.10.FOCUS12297

Khuri, 1998, The Department of Veterans Affairs' NSQIP: the first national, validated, outcome-based, risk-adjusted, and peer-controlled program for the measurement and enhancement of the quality of surgical care. National VA Surgical Quality Improvement Program, Ann Surg, 228, 491, 10.1097/00000658-199810000-00006

Birkmeyer, 2008, Blueprint for a new American College of surgeons: national surgical quality improvement program, J Am Coll Surg, 207, 777, 10.1016/j.jamcollsurg.2008.07.018

Schilling, 2010, Prioritizing perioperative quality improvement in orthopaedic surgery, J Bone Joint Surg Am, 92, 1884, 10.2106/JBJS.I.00735

Fowler, 2011, Informing and involving patients to improve the quality of medical decisions, Health Aff, 30, 699, 10.1377/hlthaff.2011.0003