Underlying cause-of-death data for this observational study were extracted from the Centers for Disease Control and Prevention Wide-Ranging Online Data for Epidemiologic Research online databases.
14 Deaths, from medical certificates, had been precoded according to
International Statistical Classification of Diseases and Related Health Problems, Tenth Revision15 coding. Selected causes were suicide (UO3, X60-X84, and Y87.0), diabetes (E10-E14), influenza and pneumonia, (J09-J18), kidney disease (N00-07, N17-19, and N25-27), and drug intoxication deaths that had first been coded by intent or manner as “accident” (X40-X44) or undetermined (Y10-14) and then, by corresponding drug groups, as nonopioid analgesics (X40, X60, and Y10), sedative hypnotics (X41, X61, and Y11), narcotics (X42, X62, and Y12), other autonomic nervous system drugs not stated (X43, X63, and Y13), and other unspecified drugs (X44, X64, and Y14).
15 Self-injury mortality was estimated as a combination of suicides by any method and “accidents” or undetermined DDSIs, assuming that 80% of “accidental” drug intoxication deaths and 90% of undetermined drug intoxication deaths for decedents 15 years and older were DDSIs.
10 (link) Disease selection was based on national ranking proximal to suicide and our expanded self-injury category among the top10 causes of death in 2013. The observation period was1999 to2014. This study received a waiver from the West Virginia University Institutional Review Board because it used open and de-identified secondary mortality data.
Rockett I.R., Lilly C.L., Jia H., Larkin G.L., Miller T.R., Nelson L.S., Nolte K.B., Putnam S.L., Smith G.S, & Caine E.D. (2016). Self-injury Mortality in the United States in the Early 21st Century: A Comparison With Proximally Ranked Diseases. JAMA psychiatry, 73(10), 1072-1081.