Of 1,150 women surveyed in Maine, 468 reported frequent multivitamin use before pregnancy. What is the prevalence of frequent use?

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_