is the largest all-payer inpatient care database in the United States, containing data on more than seven million hospital stays from approximately 1,000 hospitals. Its large sample size is ideal for developing national and regional estimates and enables analyses of rare conditions, uncommon treatments, and special populations. The following links provide summary statistics for the NIS.

Summary Statistics include means on all numeric variables, frequency distributions, and univariates on continuous variables. Summary statistics are provided by year.

Some documents are provided in Adobe® Acrobat® (PDF) format. The amount of time needed to access a document depends on your machine, browser, and Internet connection. PDF files require the Adobe® Acrobat® Reader™, which can be downloaded free of charge from Adobe®. PDF Help provides instructions on how to work with PDF files.