Table 1.
Factor | NIS | NSQIP |
---|---|---|
Identification of patients | Retrospective, a sample of inpatient discharges | Prospective, a sample of patients identified at participating institutions |
Procedure characterization | International classification of disease, 9th revision procedure codes | Current procedure terminology codes |
Comorbidity and adverse event data | Reimbursement data in the form of international classification of disease, 9th revision codes | Directed review of medical records by specially trained surgical clinical reviewers, with routine auditing to ensure quality |
Time range of data collected | Inpatient only | Inpatient and outpatient up to the 30th postoperative day |
NIS = National Inpatient Sample; NSQIP = National Surgical Quality Improvement Program.