Voters have recently decided to have fluoride added to the city water system.Epidemiologists wanting to study the effect of fluoride on dental caries would be conducting a(n):
A) Ecological study
B) Double-blind study
C) Community trial
D) Screening

Question

Quizplus · Accepted Answer

This is similar to clinical trials,but the issue is often health promotion and disease prevention rather than treatment of existing disease.

Voters Have Recently Decided to Have Fluoride Added to the City