tailieunhanh - principles of epidemiology in public health practice|_part3

biến bạn có thể bao gồm trong việc mô tả sự bùng nổ được mô tả trong Câu hỏi 7 người? A. Tuổi của hành khách B. lịch sử thực phẩm chi tiết (những gì người ăn) trong khi trên chiếc tàu C. | 12. Which variables might you include in characterizing the outbreak described in Question 7 by person A. Age of passenger B. Detailed food history what person ate while aboard ship C. Status as passenger or crew D. Symptoms 13. When analyzing surveillance data by age which of the following age groups is preferred Choose one best answer A. 1-year age groups B. 5-year age groups C. 10-year age groups D. Depends on the disease 14. A study in which children are randomly assigned to receive either a newly formulated vaccine or the currently available vaccine and are followed to monitor for side effects and effectiveness of each vaccine is an example of which type of study A. Experimental B. Observational C. Cohort D. Case-control E. Clinical trial 15. The Iowa Women s Health Study in which researchers enrolled 41 837 women in 1986 and collected exposure and lifestyle information to assess the relationship between these factors and subsequent occurrence of cancer is an example of which type s of study A. Experimental B. Observational C. Cohort D. Case-control E. Clinical trial 16. British investigators conducted a study to compare measles-mumps-rubella MMR vaccine history among 1 294 children with pervasive development disorder . autism and Asperger s syndrome and 4 469 children without such disorders. They found no association. This is an example of which type s of study A. Experimental B. Observational C. Cohort D. Case-control E. Clinical trial Source Smeeth L Cook C Fombonne E Heavey L Rodrigues LC Smith PG Ha AJ. MMR vaccination and pervasive developmental disorders. Lancet 2004 364 963-9. This is trial version EpTeosy 17. A cohort study differs from a case-control study in that A. Subjects are enrolled or categorized on the basis of their exposure status in a cohort study but not in a case-control study B. Subjects are asked about their exposure status in a cohort study but not in a casecontrol study C. Cohort studies require many years to .