Those confounded vitamins: what can we learn from the differences between observational versus randomised trial evidence?
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Associations reported in epidemiological studies can be produced by confounding.
“and can be produced by confounding (that is, by another factor that affects both the outcome and exposure)1 2 3”
From Strengthening the Reporting of Observational Studies in Epidemiology using Mendelian Randomisation (STROBE-MR): explanation and elaboration. (2021) · cites this paper as [2]
Associations reported in epidemiological studies are often not reliable estimates of causal effects.
“However, such associations reported in epidemiological studies are often not reliable estimates of causal effects”
From Strengthening the Reporting of Observational Studies in Epidemiology using Mendelian Randomisation (STROBE-MR): explanation and elaboration. (2021) · cites this paper as [2]
Associations reported in epidemiological studies can be produced by other forms of bias.
“or by other forms of bias.”
From Strengthening the Reporting of Observational Studies in Epidemiology using Mendelian Randomisation (STROBE-MR): explanation and elaboration. (2021) · cites this paper as [2]
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Self-citationBuijsse, B., Feskens, E. J. M., Schlettwein-Gsell, D., Ferry, M., Kok, F. J., Kromhout, D., & de Groot, C. P. G. M. (2005) · American Journal of Clinical Nutrition · doi:10.1093/ajcn/82.4.879 · Cited by 112 · see citing works
Bingham, S. A., Luben, R., Welch, A. A., Low, Y. L., Khaw, K., Wareham, N. J., & Day, N. (2008) · International Journal of Epidemiology · doi:10.1093/ije/dyn111 · Cited by 110 · see citing works
Lawlor, D. A. (2004) · International Journal of Epidemiology · doi:10.1093/ije/dyh124 · Cited by 109 · see citing works
Self-citationNutrition and the risk of stroke
Hankey, G. J. (2011) · The Lancet Neurology · doi:10.1016/s1474-4422(11)70265-4 · Cited by 107 · see citing works
Correlation without a cause: an epidemiological odyssey
Smith, G. D., & Phillips, A. N. (2020) · International Journal of Epidemiology · doi:10.1093/ije/dyaa016 · Cited by 107 · see citing works
Self-citationTimpson, N. J., Forouhi, N. G., Brion, M.-J., Harbord, R. M., Cook, D. G., Johnson, P., McConnachie, A., Morris, R. W., Rodriguez, S., Luan, J., et al. (2010) · The American Journal of Clinical Nutrition · doi:10.3945/ajcn.2010.29438 · Cited by 107 · see citing works
Self-citationOffspring Birth Weight and Parental Mortality: Prospective Observational Study and Meta-Analysis
Smith, G. D., Hyppönen, E., Power, C., & Lawlor, D. A. (2007) · American Journal of Epidemiology · doi:10.1093/aje/kwm054 · Cited by 107 · see citing works
Self-citationSelenium for preventing cancer
Dennert, G., Zwahlen, M., Brinkman, M. T., Vinceti, M., Zeegers, M. P., & Horneber, M. (2011) · Cochrane Database of Systematic Reviews · doi:10.1002/14651858.cd005195.pub2 · Cited by 107 · see citing works
Pfister, R., Sharp, S. J., Luben, R., Wareham, N. J., & Khaw, K. (2011) · American Heart Journal · doi:10.1016/j.ahj.2011.05.007 · Cited by 101 · see citing works
Sensitivity Analysis for Inverse Probability Weighting Estimators via the Percentile Bootstrap
Zhao, Q., Small, D. S., & Bhattacharya, B. B. (2019) · Journal of the Royal Statistical Society Series B (Statistical Methodology) · doi:10.1111/rssb.12327 · Cited by 100 · see citing works
Lawlor, D. A., Ebrahim, S. B. J., & Smith, G. D. (2005) · Journal of Epidemiology & Community Health · doi:10.1136/jech.2004.029991 · Cited by 100 · see citing works
Self-citationProspective Study of Dietary Patterns and Persistent Cough with Phlegm among Chinese Singaporeans
Butler, L. M., Koh, W., Lee, H.-P., Tseng, M., Yu, M. C., & London, S. J. (2005) · American Journal of Respiratory and Critical Care Medicine · doi:10.1164/rccm.200506-901oc · Cited by 97 · see citing works
- Authors
- Lawlor, D. A., Smith, G. D., Bruckdorfer, K. R., Kundu, D., & Ebrahim, S.
- Affiliations
- University of Bristol (GB)
- University of London (GB)
- Corresponding author
- Lawlor, Debbie A
- Venue
- The Lancet
- Publisher
- Elsevier BV
- Published
- 2004-05
- Volume
- 363
- Issue
- 9422
- Pages
- 1724-1727
- ISSN
- 0099-5355 (ISSN-L)
- 0140-6736
- OpenAlex
- W2158304798
- Cited by
- 438
- References
- 21
- Citations by year
- 2026: 2 · 2025: 16 · 2024: 13 · 2023: 23 · 2022: 16 · 2021: 18 · 2020: 13 · 2019: 10 · 2018: 17 · 2017: 4 · 2016: 25 · 2015: 18 · 2014: 18 · 2013: 13 · 2012: 19
- FWCI
- 23.12
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- The Lancet (publishedVersion)
- PubMed (publishedVersion)
- UCL Discovery (University College London) (submittedVersion)
- Topics
- Health Sciences › Medicine › Biochemistry › Antioxidant Activity and Oxidative Stress
- Health Sciences › Nursing › Nutrition and Dietetics › Vitamin C and Antioxidants Research
- Physical Sciences › Mathematics › Statistics and Probability › Advanced Causal Inference Techniques
- Keywords
- antioxidant vitamins, vitamin C supplementation, observational studies, randomized controlled trials, cardiovascular disease, cancer, all-cause mortality, vitamin supplementation, evidence synthesis
- MeSH terms
- Anthropometry, Antioxidants, Ascorbic Acid, Cardiovascular Diseases, Humans, Life Style, Research Design, Socioeconomic Factors, Health Behavior, Causality, Confounding Factors, Epidemiologic, Randomized Controlled Trials as Topic, Observation
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