Hoo, Z. orcid.org/0000-0002-7067-3783, Curley, R., Campbell, M.J. et al. (2 more authors) (2018) The importance of data issues when comparing cystic fibrosis registry outcomes between countries : are annual review FEV1 in the UK only collected when subjects are well? Journal of Evaluation in Clinical Practice, 24 (4). pp. 745-751. ISSN 1356-1294
Abstract
Rationale, aims and objective
Cross‐country comparisons of cystic fibrosis (CF) outcomes can potentially identify variation in care but are dependent on data quality. An important assumption is that the UK annual review FEV1 is only collected during periods of clinical stability. If this assumption does not hold, results of FEV1 comparisons may be biased in favour of registries with encounter‐based FEV1. We aimed to test the assumption that CF annual reviews in the UK are only performed during periods of clinical stability.
Method
Prospective encounter‐based data collected in Sheffield (n = 174) was used to establish whether annual review FEV1 were always collected during periods of clinical stability and to determine the group‐level discrepancy between annual review vs best FEV1. We then went on to quantify the group‐level discrepancy between annual review and best annual FEV1 readings within the UK registry (n = 2995) to determine if the differences observed in Sheffield also apply to the wider UK data.
Results
Sheffield results showed a group‐level discrepancy between best and annual review FEV1 of −2.5% (95% CI −3.95% to −1.2%) for annual reviews performed during periods of clinical stability (n = 50). The group‐level discrepancy is larger at −8.0% (95% CI −11.2% to −4.9%) among annual reviews performed during periods of clinical instability (n = 13). Therefore, the magnitude of this group‐level discrepancy is a surrogate for the proportion of clinically stable annual reviews—smaller discrepancy indicates a higher proportion of clinically stable annual reviews and vice versa.
The overall group‐level discrepancy in the UK registry (−5.6%, 95% CI −5.9 to −5.4%) was similar to Sheffield (−6.1%, 95% CI −7.1 to −5.1%). Around 20% of the clinician reviewed, annual reviews in Sheffield were performed during periods of clinically instability.
Conclusions
Annual review FEV1 underestimates lung health of adults with CF in the UK and may bias cross‐country comparisons.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2018 The Authors Journal of Evaluation in Clinical Practice Published by John Wiley & Sons Ltd. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. (http://creativecommons.org/licenses/by/4.0/) |
Keywords: | clinical epidemiology; cystic fibrosis; respiratory measurement |
Dates: |
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Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Medicine, Dentistry and Health (Sheffield) > School of Health and Related Research (Sheffield) > ScHARR - Sheffield Centre for Health and Related Research The University of Sheffield > Sheffield Teaching Hospitals |
Funding Information: | Funder Grant number NATIONAL INSTITUTE FOR HEALTH RESEARCH DRF-2014-07-092 |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 19 Jun 2018 14:56 |
Last Modified: | 15 Jul 2020 10:29 |
Published Version: | https://doi.org/10.1111/jep.12967 |
Status: | Published |
Publisher: | Wiley |
Refereed: | Yes |
Identification Number: | 10.1111/jep.12967 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:132126 |
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Filename: 24 2018 JECP - cohort-level FEV1 comparison.pdf
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