Nationwide Inpatient Sample (NIS)
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The Nationwide Inpatient Sample (NIS) is a database focused on hospital stay information. Users are able to use the NIS to identify, track, and analyze national trends in health care utilization, access, charges, quality, and outcomes. Background The Nationwide Inpatient Sample (NIS) is maintained by the Healthcare Cost and Utilization Project. The NIS is the largest all-payer inpatient care database in the United States. It contains data from approximately 8 million hospital stays each year. The 2009 NIS contains all discharge data from 1,050 hospitals located in 44 States, approximating a 20-percent stratified sample of U.S. community hospitals. The sampling frame for the 2009 NIS is a sample of hospitals that comprises approximately 95 percent of all hospital discharges in the United States. The NIS is the only national hospital database containing charge information on all patients, regardless of payer, including persons covered by Medicare, Medicaid, private insurance, and the uninsured. User functionality Users must pay to access the database. NIS releases for data years 1988-2009 are available from the HCUP Central Distributor. The 2009 NIS may be purchased for $50 for students and $350 for all others on a single DVD-ROM with accompanying documentation. . Data Notes NIS data are available from 1988 to 2009. The number of states in the NIS has grown from 8 in the first year to 44 at present. Beginning with the 2002 NIS, severity adjustment data elements including APR-DRGs, APS-DRGs, Disease Staging, and AHRQ Comorbidity Indicators, are available. Begi nning with the 2005 NIS, Diagnosis and Procedure Groups Files containing data elements from AHRQ software tools designed to facilitate the use of the ICD-9-CM diagnostic and procedure information are available. Beginning with the 2007 NIS, data elements describing hospital structural characteristics and provision of outpatient services are available in the Hospital Weights file. NIS Release 1 includes data from 8-11 States and spans the years 1988 to 1992. NIS Releases 2 and 3 contain data from 17 States for 1993 and 1994, respectively. NIS Releases 4 and 5 contain data from 19 States for 1995 and 1996. NIS Release 6 contains data from 22 States for 1997. NIS 1998 contains data from 22 States. NIS 1999 contains data from 24 States. NIS 2000 contains data from 28 States. NIS 2001 contains data from 33 States. NIS 2002 contains data from 35 States. NIS 2003 contains data from 37 States. NIS 2004 contains data from 37 States. NIS 2005 contains data from 37 States. NIS 2006 contains data from 38 States. NIS 2007 contains data from 40 States. NIS 2008 contains data from 42 States.
全国住院患者样本数据库（Nationwide Inpatient Sample, NIS）是一款聚焦于住院就诊信息的专业数据库。使用者可依托该库开展医疗服务利用、可及性、收费、质量与诊疗结局等领域的全国性趋势识别、追踪与分析工作。背景：该数据库由医疗成本与利用项目（Healthcare Cost and Utilization Project, HCUP）维护，是美国境内规模最大的全付费方住院护理数据库。该库年均收录约800万条住院就诊数据。2009年版NIS涵盖了美国44个州共计1050家医院的全部出院病例数据，近似覆盖全美社区医院20%的分层抽样样本。2009年版NIS的抽样框架选自覆盖全美95%住院出院病例的医院样本。NIS是全美唯一一款收录所有患者（无论付费类型）收费信息的国家级医院数据库，覆盖人群包括医疗保险（Medicare）、医疗补助（Medicaid）参保者、私人保险持有人以及无医保群体。用户使用权限：使用者需付费方可获取该数据库。1988年至2009年各年份的NIS数据可通过HCUP中央分发中心（HCUP Central Distributor）获取。2009年版NIS的售价为：学生用户50美元，其他用户350美元，载体为单张DVD-ROM并附带配套文档。数据说明：NIS数据的可获取年限为1988年至2009年，其覆盖的州数量从首个年份的8个逐步增长至当前的44个。自2002年版NIS起，数据库新增包含疾病严重程度调整相关的数据元素，具体包括APR-DRGs、APS-DRGs、疾病分期以及医疗保健研究与质量局（Agency for Healthcare Research and Quality, AHRQ）共病指标。自2005年版NIS起，可获取包含由AHRQ软件开发工具生成的国际疾病分类第9版临床修订版（International Classification of Diseases, 9th Revision, Clinical Modification, ICD-9-CM）诊断与操作信息相关数据元素的诊断与操作组文件。自2007年版NIS起，医院权重文件中新增了描述医院结构特征与门诊服务提供情况的数据元素。NIS第1版数据涵盖1988年至1992年，覆盖8至11个州；第2、3版分别对应1993年、1994年，各覆盖17个州；第4、5版分别对应1995年、1996年，各覆盖19个州；第6版对应1997年，覆盖22个州。1998年版NIS覆盖22个州，1999年版覆盖24个州，2000年版覆盖28个州，2001年版覆盖33个州，2002年版覆盖35个州，2003年版覆盖37个州，2004年版覆盖37个州，2005年版覆盖37个州，2006年版覆盖38个州，2007年版覆盖40个州，2008年版覆盖42个州。
