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. Author manuscript; available in PMC: 2018 Nov 28.
Published in final edited form as: JAMA. 2017 Nov 28;318(20):2011–2018. doi: 10.1001/jama.2017.17653

Table 1.

Required research practices for research that used the National Inpatient Sample.

Domain Research
Practice No.
Required Research Practices For Conducting Research using the
National Inpatient Sample
Data Interpretation 1 Identifying observations as hospitalization events rather than unique patients4,12
Research design 2 Not performing state-level analyses11
3 Limiting hospital-level analyses to data from years 1988–201110,14
4 Not performing physician-level analyses13,15
5 Not using non-specific secondary diagnosis codes to infer in-hospital events1620
Data analysis 6 Using survey-specific analysis methods that account for clustering, stratification and weighting6
7 Accounting for data changes in trend analyses spanning major transition periods in the dataset (1997–1998 and 2011–2012)14,21