Epidemiology and Infection

Hepatitis

Excess morbidity in the hepatitis C-diagnosed population in Scotland, 1991–2006

S. A. McDONALDa1 c1, S. J. HUTCHINSONa1a2, S. M. BIRDa2a3, P. R. MILLSa4, P. HAYESa5, J. F. DILLONa6 and D. J. GOLDBERGa1

a1 Health Protection Scotland, Glasgow, Scotland, UK

a2 Department of Mathematics and Statistics, University of Strathclyde, Glasgow, Scotland, UK

a3 MRC Biostatistics Unit, Institute of Public Health, Cambridge, UK

a4 Gartnavel General Hospital, Glasgow, Scotland, UK

a5 Edinburgh Royal Infirmary, Edinburgh, Scotland, UK

a6 Ninewells Hospital & Medical School, Dundee, Scotland, UK

SUMMARY

We estimated the excess risk of in-patient hospitalization in a large cohort of persons diagnosed with hepatitis C virus (HCV) infection, controlling for social deprivation. A total of 20 749 individuals diagnosed with HCV in Scotland by 31 December 2006 were linked to the Scottish hospital discharge database, and indirectly standardized hospitalization rates, adjusting for sex, age, year and deprivation were calculated. We observed significant excess morbidity considering episodes for: any diagnosis [standardized morbidity ratio (SMR) 3·4, 95% CI 3·3–3·5]; liver-related diagnoses (SMR 41·3, 95% CI 39·6–43·0); and only non-liver-related diagnoses (SMR 2·14, 95% CI 2·08–2·19). Cox regression analyses of the 2000–2006 data indicated increased relative risks of hospitalization for males [hazard ratio (HR) 1·1, 95% CI 1·0–1·2], older age (per 10 years) (HR 1·55, 95% CI 1·5–1·6), and those testing HIV-positive (HR 1·6, 95% CI 1·3–1·8). This study has revealed substantial excess all-cause and liver-related morbidity in the Scottish HCV-diagnosed population, even after allowing for deprivation.

(Accepted May 26 2010)

(Online publication June 29 2010)

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Correspondence:

c1 Author for correspondence: Dr S. A. McDonald, Health Protection Scotland, Clifton House, Clifton Place, Glasgow G3 7LN, Scotland, UK. (Email: smcdonald4@nhs.net)

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