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Health Serv Res. 1976 Summer; 11(2): 143–157.
PMCID: PMC1071909

Indexes of severity: underlying concepts.


Six severity indexes proposed in the health services research literature are shown to be special cases of a class of ordinal ranking functions called additive value functions. Deficiencies manifest in each of the severity indexes are discussed in relation to the properties that additive value functions must satisfy. In that severity indexes are a subset of health status indexes, the properties that imply and are implied by additive value formulations are relevant to the larger class of indexes as well.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.
  • Linn BS, Linn MW, Gurel L. Cumulative illness rating scale. J Am Geriatr Soc. 1968 May;16(5):622–626. [PubMed]
  • Baker SP, O'Neill B, Haddon W, Jr, Long WB. The injury severity score: a method for describing patients with multiple injuries and evaluating emergency care. J Trauma. 1974 Mar;14(3):187–196. [PubMed]
  • Kirkpatrick JR, Youmans RL. Trauma index. An aide in the evaluation of injury victims. J Trauma. 1971 Aug;11(8):711–714. [PubMed]
  • Ogawa M, Sugimoto T. Rating severity of the injured by ambulance attendants: Field research of trauma index. J Trauma. 1974 Nov;14(11):934–937. [PubMed]
  • APGAR V, JAMES LS. Further observations on the newborn scoring system. Am J Dis Child. 1962 Oct;104:419–428. [PubMed]

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