Adaptation of the charlson comorbidity index for register-based research in sweden

Jonas F. Ludvigsson; Peter Appelros; Johan Askling; Liisa Byberg; Juan Jesus Carrero; Anna Mia Ekström; Magnus Ekström; Karin Ekström Smedby; Hannes Hagström; Stefan James; Bengt Järvholm; Karl Michaelsson; Nancy L. Pedersen; Helene Sundelin; Kristina Sundquist; Johan Sundström

doi:10.2147/CLEP.S282475

Adaptation of the charlson comorbidity index for register-based research in sweden

Jonas F. Ludvigsson, Peter Appelros, Johan Askling, Liisa Byberg, Juan Jesus Carrero, Anna Mia Ekström, Magnus Ekström, Karin Ekström Smedby, Hannes Hagström, Stefan James, Bengt Järvholm, Karl Michaelsson, Nancy L. Pedersen, Helene Sundelin, Kristina Sundquist, Johan Sundström

Research output: Contribution to journal › Article › peer-review

Abstract

Purpose: Comorbidity indices are often used to measure comorbidities in register-based research. We aimed to adapt the Charlson comorbidity index (CCI) to a Swedish setting. Methods: Four versions of the CCI were compared and evaluated by disease-specific experts. Results: We created a cohesive coding system for CCI to 1) harmonize the content between different international classification of disease codes (ICD-7,8,9,10), 2) delete incorrect codes, 3) enhance the distinction between mild, moderate or severe disease (and between diabetes with and without end-organ damage), 4) minimize duplication of codes, and 5) briefly explain the meaning of individual codes in writing. Conclusion: This work may provide an integrated and efficient coding algorithm for CCI to be used in medical register-based research in Sweden.

Original language	English
Pages (from-to)	21-41
Number of pages	21
Journal	Clinical Epidemiology
Volume	13
DOIs	https://doi.org/10.2147/CLEP.S282475
Publication status	Published - 2021

Subject classification (UKÄ)

Public Health, Global Health, Social Medicine and Epidemiology

Keywords

Charlson comorbidity score
Comorbidity
Disease
Epidemiology
Public health
Sweden

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10.2147/CLEP.S282475

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Ludvigsson, J. F., Appelros, P., Askling, J., Byberg, L., Carrero, J. J., Ekström, A. M., Ekström, M., Smedby, K. E., Hagström, H., James, S., Järvholm, B., Michaelsson, K., Pedersen, N. L., Sundelin, H., Sundquist, K., & Sundström, J. (2021). Adaptation of the charlson comorbidity index for register-based research in sweden. Clinical Epidemiology, 13, 21-41. https://doi.org/10.2147/CLEP.S282475

@article{b9e1dd1dacea46f7adfe0c90e0360ee6,

title = "Adaptation of the charlson comorbidity index for register-based research in sweden",

abstract = "Purpose: Comorbidity indices are often used to measure comorbidities in register-based research. We aimed to adapt the Charlson comorbidity index (CCI) to a Swedish setting. Methods: Four versions of the CCI were compared and evaluated by disease-specific experts. Results: We created a cohesive coding system for CCI to 1) harmonize the content between different international classification of disease codes (ICD-7,8,9,10), 2) delete incorrect codes, 3) enhance the distinction between mild, moderate or severe disease (and between diabetes with and without end-organ damage), 4) minimize duplication of codes, and 5) briefly explain the meaning of individual codes in writing. Conclusion: This work may provide an integrated and efficient coding algorithm for CCI to be used in medical register-based research in Sweden.",

keywords = "Charlson comorbidity score, Comorbidity, Disease, Epidemiology, Public health, Sweden",

author = "Ludvigsson, {Jonas F.} and Peter Appelros and Johan Askling and Liisa Byberg and Carrero, {Juan Jesus} and Ekstr{\"o}m, {Anna Mia} and Magnus Ekstr{\"o}m and Smedby, {Karin Ekstr{\"o}m} and Hannes Hagstr{\"o}m and Stefan James and Bengt J{\"a}rvholm and Karl Michaelsson and Pedersen, {Nancy L.} and Helene Sundelin and Kristina Sundquist and Johan Sundstr{\"o}m",

year = "2021",

doi = "10.2147/CLEP.S282475",

language = "English",

volume = "13",

pages = "21--41",

journal = "Clinical Epidemiology",

issn = "1179-1349",

publisher = "Dove Medical Press Ltd.",

}

Ludvigsson, JF, Appelros, P, Askling, J, Byberg, L, Carrero, JJ, Ekström, AM, Ekström, M, Smedby, KE, Hagström, H, James, S, Järvholm, B, Michaelsson, K, Pedersen, NL, Sundelin, H, Sundquist, K & Sundström, J 2021, 'Adaptation of the charlson comorbidity index for register-based research in sweden', Clinical Epidemiology, vol. 13, pp. 21-41. https://doi.org/10.2147/CLEP.S282475

TY - JOUR

T1 - Adaptation of the charlson comorbidity index for register-based research in sweden

AU - Ludvigsson, Jonas F.

AU - Appelros, Peter

AU - Askling, Johan

AU - Byberg, Liisa

AU - Carrero, Juan Jesus

AU - Ekström, Anna Mia

AU - Ekström, Magnus

AU - Smedby, Karin Ekström

AU - Hagström, Hannes

AU - James, Stefan

AU - Järvholm, Bengt

AU - Michaelsson, Karl

AU - Pedersen, Nancy L.

AU - Sundelin, Helene

AU - Sundquist, Kristina

AU - Sundström, Johan

PY - 2021

Y1 - 2021

N2 - Purpose: Comorbidity indices are often used to measure comorbidities in register-based research. We aimed to adapt the Charlson comorbidity index (CCI) to a Swedish setting. Methods: Four versions of the CCI were compared and evaluated by disease-specific experts. Results: We created a cohesive coding system for CCI to 1) harmonize the content between different international classification of disease codes (ICD-7,8,9,10), 2) delete incorrect codes, 3) enhance the distinction between mild, moderate or severe disease (and between diabetes with and without end-organ damage), 4) minimize duplication of codes, and 5) briefly explain the meaning of individual codes in writing. Conclusion: This work may provide an integrated and efficient coding algorithm for CCI to be used in medical register-based research in Sweden.

AB - Purpose: Comorbidity indices are often used to measure comorbidities in register-based research. We aimed to adapt the Charlson comorbidity index (CCI) to a Swedish setting. Methods: Four versions of the CCI were compared and evaluated by disease-specific experts. Results: We created a cohesive coding system for CCI to 1) harmonize the content between different international classification of disease codes (ICD-7,8,9,10), 2) delete incorrect codes, 3) enhance the distinction between mild, moderate or severe disease (and between diabetes with and without end-organ damage), 4) minimize duplication of codes, and 5) briefly explain the meaning of individual codes in writing. Conclusion: This work may provide an integrated and efficient coding algorithm for CCI to be used in medical register-based research in Sweden.

KW - Charlson comorbidity score

KW - Comorbidity

KW - Disease

KW - Epidemiology

KW - Public health

KW - Sweden

U2 - 10.2147/CLEP.S282475

DO - 10.2147/CLEP.S282475

M3 - Article

C2 - 33469380

AN - SCOPUS:85099720348

SN - 1179-1349

VL - 13

SP - 21

EP - 41

JO - Clinical Epidemiology

JF - Clinical Epidemiology

ER -

Adaptation of the charlson comorbidity index for register-based research in sweden

Abstract

Subject classification (UKÄ)

Keywords

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