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The Social Security Death Index (SSDI) is a database of death records created from the United States Social Security Administration's Death Master File Extract. Most persons who have died since 1936 who had a Social Security Number (SSN) and whose death has been reported to the Social Security Administration are listed in the SSDI.〔(【引用サイトリンク】url=http://www.ntis.gov/products/ssa-dmf.aspx )〕 For most years since 1973, the SSDI includes 93 percent to 96 percent of deaths of individuals aged 65 or older.〔Mark E. Hill and Ira Rosenwaike, "(The Social Security Administration’s Death Master File: The Completeness of Death Reporting at Older Ages )", ''Social Security Bulletin'', Vol. 64, No. 1 (2001/2002), p. 45.〕 It is frequently updated; the version of June 22, 2011 contained 89,835,920 records.〔(【引用サイトリンク】title=Social Security Death Index Interactive Search ) 〕 Unlike the Death Master File, the SSDI is available free from several genealogy websites. The SSDI is a popular tool for genealogists and biographers because it contains valuable genealogical data. It is also useful for medical research such as clinical trials and epidemiology, because where survival data is missing from medical records (for reasons such as loss to follow-up), the SSDI can be used to backfill it. ==Social Security Death Index data== The data include: * Given name and surname; and since the 1990s, middle initial * Date of birth * Month and year of death; or full date of death for accounts active in 2000 or later * Social Security number * State or territory where the Social Security number was issued * Last place of residence while the person was alive (ZIP code) Once a deceased person is found in the database, the person's application for Social Security card (Form SS-5) can be ordered from the Social Security Administration. The SS-5 may contain additional genealogical data, such as birthplace, father's name, and mother's full maiden name or that information may be blacked out. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Social Security Death Index」の詳細全文を読む スポンサード リンク
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