People shouldn't stop taking them based on this observational study.

Observational studies such as this one don't prove cause and effect.

This problem can be very severe, for example, in the observational study.

We need to look at all the available data and not discount the observational studies.

If you make an observational study, it's probably not appropriate to use that information in making treatment decisions.

Some attack the methodology of the American research, yet other observational studies have produced similar results.

The design of an experiment or observational study often influences the power.

A. What's important about observational studies is that they are what we call hypothesis generating.

About 200 mother and daughter pairs participated in this observational study.

By contrast, observational studies, in which patients themselves decide whether to take a drug, are considered less reliable.