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Although observational studies cannot prove causality, the findings of this study are consistent with the possibility that immunomodulation resulting directly from sun exposure may influence outcomes in patients with multiple sclerosis.
The study results, published in the New England Journal of Medicine, did not support earlier observational studies suggesting a link between lower colorectal cancer risk with higher vitamin D blood levels or greater calcium intake.
Researchers from Kings College London conducted a meta-analysis of 61 observational studies comprising almost 15,000 tobacco users and 273,000 non users.
Observational studies have found consumption of vegetarian diets is associated with a lower prevalence of hypertension, but randomised clinical trials have produced conflicting results as to whether the adoption of a vegetarian diet reduces BP.
Interest in registration of observational studies is growing.
the arguments of randomized clinical trials versus 'real world' observational studies (internal/external validity, bias) will be debated, with the focus on the use of observational data (administrative data as well as prospective observational data) studies in health care decision making.
The first study, by lead author and cardiovascular epidemiologist Rajiv Chowdhury, conducted a meta-analysis of observational studies and randomized-controlled trials to determine if vitamin D was associated with mortality from cardiovascular, cancer or other health issues.
Evidence from three observational studies suggests colchicine has a strong protective effect against cardiovascular events in gout patients.
Prof Philippe Autier, from the International Prevention Research Institute in Lyon, carried out a survey of information from 290 prospective observational studies and 172 randomised trials that looked at the effects of vitamin D levels on health outcomes, excluding bone health, up to December 2012.
Observational studies were deemed not only enough to show that patient satisfaction is high and that homoeopathy improves quality of life but also were seen as a highly relevant and important measurement tool not to be dismissed as low in the hierarchy of significance in homoeopathy research.
CHINA -- Researchers conducted a literature search in order to identify observational studies and clinical trials in which vitamin [B.
This study compared the reported effect sizes of cardiovascular biomarkers in datasets from observational studies with those in datasets from randomised controlled trials using a review of meta-analyses.

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