observational study


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observational study

A research study in which the results are obtained retrospectively or without a control group. Some examples include case reports, chart reviews, and longitudinal studies of large cohorts followed over time.
Synonym: observational trial
See also: study
References in periodicals archive ?
Cross-sectional observational study. The subjects for the analysis were all the observational studies published in RCA between 2000 (volume 28) and 2013 (volume 41).
The observational study found that oseltamivir use decreased the risk for death in patients of all ages with influenza (1 death/39,202 patients) compared with untreated patients (56 deaths/136,799 patients; p = 0.02).
Data Source: This prospective observational study featured 26 years of biannual follow-up of nearly 100,000 male and female health care professionals in the Nurses' Health Study and the Health Professionals Follow-Up Study.
Diepgen of the University of Heidelberg (Germany), who presented the results of the observational study emphasizing patient-reported outcomes in 826 patients whose actinic keratoses (AKs) were treated with ingenol mebutate (Picato) in 292 German dermatologists' offices.
This is the first observational study to describe a significant association between lipid-lowering medications and decreased stroke risk.
The 18 outpatients who participated in this 12-month, prospective, observational study showed significant improvements in many measures of psychopathology after the switch to long-acting injectable therapy.
[3] Nonstandard abbreviations: OS, observational study; CT, clinical trial; RCT, randomized controlled trial.
KEY WORDS: Epidemiologic research design; Research design; Comparative study; Observational study; Study characteristics.INTRODUCTION
We intentionally read the article "Association of aortic flow propagation velocity with ankle-brachial blood pressure index in patients with hypertension: an observational study." written by Gunes et al.
Observational study In an observational study, researchers watch groups of people instead of doing something to them.
Meta-analyses of emerging cardiovascular biomarkers (not part of the Framingham risk score) that included datasets from at least one observational study and at least one randomised controlled trial were identified through Medline (last update, January 2011).
Our objective was to use an experimental and observational study to determine how forest songbird-habitat quality is related to soil calcium availability.

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