Examlex
For a patient with bronchiectasis to reduce the risk of his/her condition worsening, which of the following should be done?
1) Avoid air pollution.
2) Get an influenza vaccination.
3) Take an antibiotic every day.
4) Avoid smoking.
Placebo
A substance or treatment which is designed to have no therapeutic value, commonly used as a control in testing new drugs.
Correlation Coefficient
A statistical measure that describes the degree to which two variables move in relation to each other, ranging from -1 to 1.
Perfect Correlation
A statistical relationship indicating a flawless direct or inverse linkage between two variables.
Matched Design
A research design that matches the experimental participants with control participants who are similar on key characteristics.
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