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The Agency for Healthcare Research and Quality (AHRQ) offers practical, research-based tools and other resources to help a variety of health care organizations, providers and others make care safer in all health care settings.
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The National (Nationwide) Inpatient Sample (NIS) is the largest all-payer inpatient care database in the United States, containing data on more than seven million hospital stays. Its large sample size is ideal for developing national and regional estimates and enables analyses of rare conditions, uncommon treatments, and special populations.