Open Access Correspondence

External review and validation of the Swedish national inpatient register

Jonas F Ludvigsson*, Eva Andersson, Anders Ekbom, Maria Feychting, Jeong-Lim Kim, Christina Reuterwall, Mona Heurgren and Petra Otterblad Olausson

BMC Public Health 2011, 11:450  doi:10.1186/1471-2458-11-450

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The Swedish ICD-8 was introduced in 1969

Jonas Ludvigsson   (2012-10-22 13:09)  Karolinska University Hospital, Karolinska Institute email

This is to inform the readers of this paper that there is an error in Figure 1. The Swedish ICD-8 classification ("Klassifikation av sjukdomar 1968") was PUBLISHED in 1968, but ICD-8 per se was INTRODUCED in 1969. Hence, ICD-7 was used throughout year 1968, and ICD-8 was used from 1969. See also: Bj��rn Smedby, Gunnar Schi��ler: Health Classifications in the Nordic countries. Historic development in a national and international perspective. NOMESCO, Copenhagen 2006. Jonas F Ludvigsson Corresponding author.

Competing interests

None

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