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Of 1,150 women surveyed in Maine, 468 reported frequent multivitamin use before pregnancy. What is the prevalence of frequent use?
A59.3%
B2.46%
C40.7%
D4.07%
Answer & Solution
Correct answer: C. 40.7%
1. Prevalence of an attribute divides the people with the attribute by the population surveyed.
2. 468 divided by 1,150 equals 0.407.
3. Multiplying by 100 gives 40.7%.
4. 59.3% is the complement, the share of women who did not report frequent use.
5. 4.07% divides correctly but applies a multiplier of 10 rather than 100.
6. 2.46% turns the fraction over, since 1,150 divided by 468 equals 2.46.
_Source: CDC Principles of Epidemiology in Public Health Practice (3rd ed., US federal, public domain), Lesson 3 "Measures of Risk", section Definition of prevalence_
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