A nurse is reading the research article “Efficacy of Informational Letters on Hepatitis B Immunization Rates in University Students” (Marron, R.L., Lanphear, B.P., Kouides, R., Dudman, L., Manchester, R.A., & Christy, C. [1998]. Journal of American College Health, 47(3), 123–127). In the article, the researchers analyzed the means by which the students learned about the hepatitis B vaccine and compared that information with whether or not the students actually received the vaccine. Table 3-1 describes the data. Which of the following interpretations of the data from Table 3-1 is correct? 1. When one considers those who “read/heard” about the vaccine, there is no significant difference between the percentage of students who received the immunization and those who did not receive the immunization. 2. The likelihood of students who receive the vaccine when they learned about it from the “health history form” was about 1.6 times that of the “health history form” students who did not receive the vaccine. 3. 44.4% of those who were not vaccinated received their information from “Letters.” 4. The largest percentage of students who received the vaccine learned about it from the “University Health Service (UHS) providers.”

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