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The problems and limitations of cohort studies

Warren Lenney, Francis J. Gilchrist, Aphrodite Kouzouna, Anand D. Pandyan, Val Ball
Breathe 2014 10: 306-311; DOI: 10.1183/20734735.002313
Warren Lenney
1University Hospital of North Staffordshire, Stoke on Trent, and
2Institute of Science and Technology in Medicine, and
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  • For correspondence: Warren.lenney@uhns.nhs.uk
Francis J. Gilchrist
1University Hospital of North Staffordshire, Stoke on Trent, and
2Institute of Science and Technology in Medicine, and
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Aphrodite Kouzouna
3School of Health Rehabilitation, Keele University, Keele, UK
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Anand D. Pandyan
3School of Health Rehabilitation, Keele University, Keele, UK
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Val Ball
3School of Health Rehabilitation, Keele University, Keele, UK
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Summary

Chronic obstructive pulmonary disease (COPD) is the third most common cause of mortality worldwide and it is important to discover whether risk factors can be identified from studies undertaken in childhood.

Numerous longitudinal cohort studies have been developed in many parts of the world to better understand the long-term outcomes of chronic respiratory diseases. Using data they have generated, it should be possible to identify specific risk factors in children and develop a model to prioritise their importance when found, in order to consider ways to reduce the prevalence and/or severity of disease in adults. However, this does require the sharing of data within the field, as is happening in other related fields, such as the Virtual International Stroke Trial Archive (www.vista.gla.ac.uk). Pooling of the raw data could be very informative and an organisation such as the European Respiratory Society could play an important role in ensuring this happens.

Unfortunately, cohort studies vary widely in their inclusion criteria, their methodology and the format in which lung function data are presented. The raw data required to develop a model to assess the impact of childhood risk factors on future lung function have not been made available from many of the published articles.

Our initial belief that recognised risk factors are independent variables was naïve and a different approach is required to better understand their interdependence.

Footnotes

  • Statement of Interest

    GlaxoSmithKline funded the original study discussed in this article through an educational grant, but had no input into the process or writing of this review.

  • ©ERS 2014

Breathe articles are open access and distributed under the terms of the Creative Commons Attribution Non-Commercial Licence 4.0.

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The problems and limitations of cohort studies
Warren Lenney, Francis J. Gilchrist, Aphrodite Kouzouna, Anand D. Pandyan, Val Ball
Breathe Dec 2014, 10 (4) 306-311; DOI: 10.1183/20734735.002313

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The problems and limitations of cohort studies
Warren Lenney, Francis J. Gilchrist, Aphrodite Kouzouna, Anand D. Pandyan, Val Ball
Breathe Dec 2014, 10 (4) 306-311; DOI: 10.1183/20734735.002313
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