Journal Article

Quality of Reporting of Observational Longitudinal Research

Leigh Tooth, Robert Ware, Chris Bain, David M. Purdie and Annette Dobson

in American Journal of Epidemiology

Published on behalf of Johns Hopkins Bloomberg School of Public Health

Volume 161, issue 3, pages 280-288
Published in print February 2005 | ISSN: 0002-9262
Published online February 2005 | e-ISSN: 1476-6256 | DOI:
Quality of Reporting of Observational Longitudinal Research

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Observational longitudinal research is particularly useful for assessing etiology and prognosis and for providing evidence for clinical decision making. However, there are no structured reporting requirements for studies of this design to assist authors, editors, and readers. The authors developed and tested a checklist of criteria related to threats to the internal and external validity of observational longitudinal studies. The checklist criteria concerned recruitment, data collection, biases, and data analysis and descriptive issues relevant to study rationale, study population, and generalizability. Two raters independently assessed 49 randomly selected articles describing stroke research published from 1999 to 2003 in six journals: American Journal of Epidemiology, Journal of Epidemiology and Community Health, Stroke, Annals of Neurology, Archives of Physical Medicine and Rehabilitation, and American Journal of Physical Medicine and Rehabilitation. On average, 17 of the 33 checklist criteria were reported. Criteria describing the study design were better reported than those related to internal validity. No relation was found between study type (etiologic or prognostic) or word count and quality of reporting. A flow diagram for summarizing participant flow through a study was developed. Editors and authors should consider using a checklist and flow diagram when reporting on observational longitudinal research.

Keywords: epidemiologic factors; longitudinal studies; CONSORT, Consolidated Standards of Reporting Trials; SD, standard deviation.

Journal Article.  6062 words.  Illustrated.

Subjects: Public Health and Epidemiology

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