The problems and limitations of cohort studies

Warren Lenney; Francis J. Gilchrist; Aphrodite Kouzouna; Anand D. Pandyan; Val Ball

doi:10.1183/20734735.002313

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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Figure 1
a)Standardised mortality ratios for chronic bronchitis in men and women (1968–1978) and b) infant mortality from bronchitis and pneumonia per 1000 births (1921–1925) in areas of England and Wales. Reproduced from [2] with permission from the publisher.

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