HCUP National Inpatient Database

The NIS is the largest publicly available all-payer inpatient healthcare database designed to produce U.S. regional and national estimates of inpatient utilization, access, cost, quality, and outcomes. Unweighted, it contains data from around 7 million hospital stays each year. Weighted, it estimates around 35 million hospitalizations nationally. Developed through a Federal-State-Industry partnership sponsored by the Agency for Healthcare Research and Quality (AHRQ), HCUP data inform decision making at the national, State, and community levels.

Its large sample size is ideal for developing national and regional estimates and enables analyses of rare conditions, uncommon treatments, and special populations.

国家住院样本数据库（National Inpatient Sample，NIS）是目前规模最大的公开可获取的全付费方住院医疗数据库，旨在生成美国区域级与国家级的住院服务利用、可及性、成本、质量及结局相关估算数据。该数据库未经加权时，每年收录约700万次住院就诊数据；经加权处理后，可估算出全美范围内约3500万次住院人次。本数据库由美国医疗保健研究与质量局（Agency for Healthcare Research and Quality，AHRQ）资助，通过联邦-州级-行业合作模式开发，其所属的医疗成本与利用项目（Healthcare Cost and Utilization Project，HCUP）数据可为国家级、州级及社区级的决策提供支撑。

其庞大的样本量非常适合生成国家级与区域级估算数据，同时支持对罕见病症、非常规治疗方案及特殊人群开展分析研究。