observational study उदाहरण वाक्य

In observational studies, decrease in cleaning frequency turned out to be correlated to increase in cleaning durations.
Given that these are observational studies, caution must be given to the possibility of confounding by indication.
His main research field is the observational study and theoretical modelling of the dust environment in comets.
This approach is sometimes used in observational studies to reduce or eliminate the effects of confounding factors.
A general limitation of observational studies is that the relative influences of genes and environment are confounded.

Observational studies have suggested many health benefits from hormone replacement, but more recent controlled trials have disagreed.
Small randomized studies, Peto said, concluded that vitamin E protected against heart disease, as did large observational studies.
In observational studies smoking cessation has benefits in depression as large as or larger than those of medications.
This review included two trials and two observational studies with almost eleven thousand HIV infected children and adolescents.
Yet the link between designed urban space and human mind appears to be observational study and historical record.