Asked by Onaiz Fahim on Apr 27, 2024
Verified
Epidemiologists decided to investigate the effect of sunscreens on sunburns.They ran an epidemiologic study to see the association of sunscreens and sunburns.Overall,460 people have enrolled in the study.Investigators randomly allocated 230 people to the treatment group (sunscreens) and 230 to the control group (placebo) .They exposed those 460 people to the high mountain trail on a sunny day.At the end of the study,30 people developed sunburns in the sunscreen group and 130 people developed sunburns in the placebo group.What is the risk of developing sunburns in the placebo group?
A) 0.13
B) 0.15
C) 0.23
D) 0.57
E) 1
Risk
refers to the probability of occurrence of harm or loss associated with an action or event.
Epidemiologic Study
Research investigating the distribution and determinants of health and diseases in populations.
Sunscreens
Products that are applied to the skin to protect it from the harmful effects of ultraviolet (UV) radiation from the sun.
- Determine incidence rates in the context of cohort investigations.
Verified Answer
FB
Francy BlancApr 28, 2024
Final Answer :
D
Explanation :
The population at risk in the placebo group is 230,and the number of positive outcomes (sunburns) in the placebo group is 130.Therefore the risk of developing sunburns in the placebo group is 0.57 (130 divided by 230).
Learning Objectives
- Determine incidence rates in the context of cohort investigations.
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