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01.12.2012 | Research | Ausgabe 1/2012 Open Access

Health and Quality of Life Outcomes 1/2012

Characterizing the relationship between health utility and renal function after kidney transplantation in UK and US: a cross-sectional study

Zeitschrift:
Health and Quality of Life Outcomes > Ausgabe 1/2012
Autoren:
Luca Neri, Phil McEwan, Karin Sennfält, Kesh Baboolal
Wichtige Hinweise

Electronic supplementary material

The online version of this article (doi:10.​1186/​1477-7525-10-139) contains supplementary material, which is available to authorized users.

Competing interest

LN and PME received consulting fees from BMS pharmaceuticals. KS is employed at BMS pharmaceuticals. KB has no competing interests.

Authors' contributions

Study design: LN and PME. Data Analysis: LN. Interpretation of results: LN, PME, KS, KB. First draft: LN. Revision and Final draft: LN, PME, KS, KB. All authors read and approved the final manuscript

Abstract

Background

Chronic allograft nephropathy (CAN) occurs in a large share of transplant recipients and it is the leading cause of graft loss despite the introduction of new and effective immunosuppressants. The reduction in renal function secondary to immunologic and non-immunologic CAN leads to several complications, including anemia and calcium-phosphorus metabolism imbalance and may be associated to worsening Health-Related Quality of Life. We sought to evaluate the relationship between kidney function and Euro-Qol 5 Dimension Index (EQ-5Dindex) scores after kidney transplantation and evaluate whether cross-cultural differences exist between UK and US.

Methods

This study is a secondary analysis of existing data gathered from two cross-sectional studies. We enrolled 233 and 209 subjects aged 18–74 years who received a kidney transplant in US and UK respectively. For the present analysis we excluded recipients with multiple or multi-organ transplantation, creatinine kinase ≥200 U/L, acute renal failure, and without creatinine assessments in 3 months pre-enrollment leaving 281 subjects overall. The questionnaires were administered independently in the two centers. Both packets included the EQ-5Dindex and socio-demographic items. We augmented the analytical dataset with information abstracted from clinical charts and administrative records including selected comorbidities and biochemistry test results. We used ordinary least squares and quantile regression adjusted for socio-demographic and clinical characteristics to assess the association between EQ-5Dindex and severity of chronic kidney disease (CKD).

Results

CKD severity was negatively associated with EQ-5Dindex in both samples (UK: ρ= −0.20, p=0.02; US: ρ= −0.21, p=0.02). The mean adjusted disutility associated to CKD stage 5 compared to CKD stage 1–2 was Δ= −0.38 in the UK sample, Δ= −0.11 in the US sample and Δ= −0.22 in the whole sample. The adjusted median disutility associated to CKD stage 5 compared to CKD stage 1–2 for the whole sample was 0.18 (p<0.01, quantile regression). Center effect was not statistically significant.

Conclusions

Impaired renal function is associated with reduced health-related quality of life independent of possible confounders, center-effect and analytic framework.
Zusatzmaterial
Authors’ original file for figure 1
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Authors’ original file for figure 2
12955_2012_1032_MOESM2_ESM.tiff
Authors’ original file for figure 3
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Literatur
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