Controlled clinical trials enable researchers to:
Controlled clinical trials enable researchers to:
The purpose of double-blinding in clinical trials is to:
Randomized, controlled clinical trials are used in the pharmaceutical industry to do all of the following EXCEPT:
To test the efficacy of a health education program in reducing the risk of food-borne and water-borne diseases, two Peruvian villages were given an intensive health education program. At the end of two years, the incidence rates of important water-borne and food-borne diseases in these villages were compared with those in two similar control villages without any education program.
This is an example of what type of study?
To test the efficacy of vitamin C in preventing colds, army recruits are randomly assigned to one of two groups: one group received 500 mg of vitamin C daily; another group received 500 mg of a placebo daily. Both groups are followed to determine the number and severity of subsequent colds.
This is an example of what type of study?
A study was carried out to determine whether phenylbutazone (PB) treatment is a risk factor for the development of neutropenia. The medical records of 300 children (150 who had neutropenia and 150 who did not have neutropenia) were investigated. One hundred of the children with neutropenia had been treated with PB in the past, while 70 children without neutropenia had been treated with PB in the past.
What type of study is this?
Researchers collected baseline information on oral contraceptive use from a group of female college seniors from a large university. Each year for the next twenty years the women were followed up with to determine whether or not the participants had developed any of several conditions.
What type of study is this?
Over the past two years efforts were made to identify and determine the mortality and morbidity experience of several thousand military personnel who were stationed in the Persian Gulf and elsewhere in Europe in 1991.
What type of study is this?
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